tough nut to crack
hard nut to crack
killer
problematic
brainteaser
three-pipe problem
bitch
mountain to climb
stumper
poser
pig
rub
problem
ambitious
mountain
intractable
unsolvable
superchallenge
snag
nodus
enigma
square the circle
riddle
crux
brain-teaser
mean
conundrum
enodation
doo-doo
crack
bring off
enmesh
praemunire
task
glove
skittish
trouble
torfer
stumblingblock
pain point
hard-set
overchallenge
hard put
Matterhorn
recalcitrant
snorter
counterdifficulty
tough sledding
job
manifold
involved
unmanageable
uphill
megachallenge
boil the ocean
imponderable
hard
uncontrollable
situation
hard time
solvability
in a bind
multiproblem
rub along
mission impossible
catch a cold
difficultate
wing and prayer
challenging
shit
unsolvably
daunting
rough sledding
wicked problem
rigour
lightning in a bottle
get out
trickily
hardpressed
hard sledding
a problem shared is a problem halved
dilemmaticity
science
dilemma
dilemmatically
toughness
unachievable
challenge
deep
hard going
baroque
tricky
complicated
brain-bending
wrestle
problematic
ambitious
intractable
mean
skittish
hard-set
hard put
recalcitrant
manifold
involved
unmanageable
imponderable
uncontrollable
multiproblem
challenging
daunting
hardpressed
unachievable
baroque
tricky
complicated
brain-bending
uphill
hard
unsolvably
trickily
dilemmatically
tough nut to crack
hard nut to crack
killer
brainteaser
three-pipe problem
bitch
mountain to climb
stumper
poser
pig
rub
problem
mountain
unsolvable
superchallenge
snag
nodus
enigma
riddle
crux
brain-teaser
conundrum
enodation
doo-doo
praemunire
task
glove
trouble
torfer
stumblingblock
pain point
overchallenge
snorter
counterdifficulty
tough sledding
job
megachallenge
situation
hard time
solvability
mission impossible
wing and prayer
shit
rough sledding
wicked problem
rigour
lightning in a bottle
hard sledding
dilemmaticity
dilemma
toughness
challenge
deep
wrestle
square the circle
crack
bring off
enmesh
boil the ocean
rub along
catch a cold
difficultate
get out
science
challenge
noun
- A difficult or confounding problem.
- An obviously gay man.
- Something unforgiving and unpleasant.
- A female dog or other canine, particularly a recent mother.
- A man considered weak, effeminate, timid or pathetic in some way
- A queen.
- Place; situation
- A complaint, especially when the complaint is unjustified.
- A woman.
- Friend.
- A despicable or disagreeable, aggressive person, usually a woman.
- A submissive person who does what others want; (prison slang) a man forced or coerced into a homoerotic relationship.
- A queen playing card, particularly the queen of spades in the card game of hearts.
verb
noun
- A particularly difficult question or puzzle.
- Someone who, or something which, poses; a person who sets their body in a fixed position, such as for photography or painting.
- A poseur; someone who affects some behaviour, style, attitude or other condition, often to impress or influence others.
- Someone who asks a question or sets a problem.
noun
- A difficult problem.
- Any of several mammalian species of the genus Sus, having cloven hooves, bristles and a nose adapted for digging; especially the domesticated animal Sus domesticus.
- A light pinkish-red colour, like that of a pig (also called pig pink).
- A lead container used for radioactive waste.
- A young swine, a piglet (contrasted with a hog, an adult swine).
- A simple dice game in which players roll the dice as many times as they like, either accumulating a greater score or losing previous points gained.
- The general-purpose M60 machine gun, considered to be heavy and bulky.
- Someone who overeats or eats rapidly and noisily.
- The edible meat of such an animal; pork.
- A dirty or slovenly person.
- A police officer.
- A lecherous or sexist man.
- The mold in which a block of metal is cast.
- A device for cleaning or inspecting the inside of an oil or gas pipeline, or for separating different substances within the pipeline. Named for the pig-like squealing noise made by their progress.
- A very obese person.
- An earthenware hot-water jar to warm a bed; a stone bed warmer
- A block of cast metal.
- earthenware, or an earthenware shard
verb
noun
- A difficulty or problem.
- A loan.
- An act of rubbing.
- In the game of crown green bowls, any obstacle by which a bowl is diverted from its normal course.
- Any substance designed to be applied by rubbing.
- A mixture of spices applied to meat before it is barbecued.
verb
- To scour; to burnish; to polish; to brighten; to cleanse; often with up or over.
- To hinder; to cross; to thwart.
- To move (one object) while maintaining contact with another object over some area, with pressure and friction.
- To touch the jack with the bowl.
- To be rubbed against something.
- To rub something against (a second thing).
- To spread a substance thinly over; to smear.
noun
- A difficult task or challenge.
- An elevation of land of considerable dimensions rising more or less abruptly, forming a conspicuous figure in the landscape, usually having a small extent of surface at its summit.
- Something very large in size or quantity; a huge amount; a great heap.
- Wine from Malaga made from grapes that grow on a mountain.
- A woman's large breast.
- The twenty-first Lenormand card.
noun
- A problem or difficulty with something.
- A stump or base of a branch that has been lopped off; a short branch, or a sharp or rough branch.
- A sausage.
- A tooth projecting beyond the others; a broken or decayed tooth.
- A goal.
- A misnaged, an opponent to Chassidic Judaism (more likely modern, for cultural reasons).
- A dead tree that remains standing.
- A tree, or a branch of a tree, fixed in the bottom of a river or other navigable water, and rising nearly or quite to the surface, by which boats are sometimes pierced and sunk.
- Any sharp protuberant part of an object, which may catch, scratch, or tear other objects brought into contact with it.
- A pulled thread or yarn, as in cloth.
- One of the secondary branches of an antler.
verb
- To obtain or pick up.
- To damage or sink (a vessel) by collision; said of a tree or branch fixed to the bottom of a navigable body of water and partially submerged or rising to just beneath the surface.
- To cut the snags or branches from, as the stem of a tree; to hew roughly.
- To fish by means of dragging a large hook or hooks on a line, intending to impale the body (rather than the mouth) of the target.
- To catch or tear (e.g. fabric) upon a rough surface or projection.
adj
- Difficult, tricky.
- Intending to cause harm, successfully or otherwise; bearing ill will towards another.
- Low in quality or degree; inferior; poor; shabby.
- Having the mean (see noun below) as its value; average.
- Disobliging; pettily offensive or unaccommodating.
- Ungenerous; stingy; tight-fisted.
- Accomplished with great skill; deft; hard to compete with.
- Of a common or low origin, grade, or quality; common; humble.
- Of little value or worth; worthy of little or no regard; contemptible; despicable.
- Powerful; fierce; strong.
- Without dignity of mind; destitute of honour; low-minded; spiritless; base.
noun
- The middle part of three-part polyphonic music; now specifically, the alto part in polyphonic music; an alto instrument.
- Something which is intermediate or in the middle; an intermediate value or range of values; a medium.
- The average of a set of values, calculated by summing them together and dividing by the number of terms; the arithmetic mean.
- Any function of multiple variables that satisfies certain properties and yields a number representative of its arguments; or, the number so yielded; a measure of central tendency.
- Either of the two numbers in the middle of a conventionally presented proportion, as 2 and 3 in 1:2=3:6.
- A method or course of action used to achieve some result.
verb
- To be of some level of importance.
- To have as intentions of a given kind.
- To intend an ensuing comment or statement as an explanation.https://www.lexico.com/en/definition/i_mean%20I%20mean
- To cause or produce (a given result); to bring about (a given result).
- Of a word, symbol etc: to have reference to, to signify.
- To have conviction in (something said or expressed); to be sincere in (what one says).
- Of a person (or animal etc): to intend to express, to imply, to hint at, to allude.
- To intend (something) for a given purpose or fate; to predestine.
- To intend, to plan (to do); to have as one's intention.
- To lament.
- To convey (a given sense); to signify, or indicate (an object or idea).
noun
verb
- To solve a difficult problem.
- To change rapidly in register.
- To become debilitated by psychological pressure.
- To form cracks.
- To make a cracking sound.
- To break open or crush to small pieces by impact or stress.
- To make a crack or cracks in.
- To make a sharply humorous comment.
- To open slightly.
- To overcome a security system or component.
- To break down (a complex molecule), especially with the application of heat: to pyrolyse.
- To break apart under force, stress, or pressure.
- To alternate between high and low register in the process of eventually lowering.
- To strike forcefully.
- To cause to yield under interrogation or other pressure.
- To circumvent software restrictions such as regional coding or time limits.
- To tell (a joke).
- To break down or yield, especially under interrogation or torture.
- To cause to make a sharp sound.
- To realize that one is transgender.
- To barely reach, attain to (a measurement, extent).
- To open a canned beverage, or any packaged drink or food.
noun
- An attempt at something.
- A sharp, resounding blow.
- The tone of voice when changed at puberty.
- A program or procedure designed to circumvent restrictions or usage limits on software.
- Vagina.
- The space between the buttocks.
- A narrow opening.
- Any sharp sound.
- A thin and usually jagged space opened in a previously solid material.
- A sharply humorous comment; a wisecrack.
- a meaningful chat.
- Something good-tasting or habit-forming.
- Extremely silly, absurd or off-the-wall ideas or prose.
- Conviviality; fun; good conversation, chat, gossip, or humorous storytelling; good company.
- The sharp sound made when solid material breaks.
- Business; events; news.
- Crack cocaine, a potent, relatively cheap, addictive variety of cocaine; often a rock, usually smoked through a crack-pipe.
adj
noun
- A difficulty or predicament.
- Crime, offence, wrongdoing.
- Any of a number of criminal offences incurring similar penalties to the original offence of praemunire.
- The penalty for this offence.
- The offence in English law of bringing suit in or obeying a foreign (especially papal) court or authority, thus challenging the supremacy of the Crown. The offence was created by the Statute of Praemunire 1393 (16 Richard II, chapter 5), and abolished by the Criminal Law Act 1967 (chapter 58).
- The writ charging a person with this offence, the writ of praemunire facias.
verb
noun
noun
- a state of difficulty that needs to be resolved
- the principal activity in your life that you do to earn money
- a specific piece of work required to be done as a duty or for a specific fee
- a workplace; as in the expression `on the job'
- an object worked on; a result produced by working
- the responsibility to do something
- the performance of a piece of work
- a damaging piece of work
- (computer science) a program application that may consist of several steps but is a single logical unit
- a crime (especially a robbery)
verb
adj
- Complicated.
- Many in number, numerous; multiple, multiplied.
- Various in kind or quality; diverse.
- Exhibited at diverse times or in various ways.
noun
- A copy made by the manifold writing process.
- A pipe fitting or similar device that connects multiple inputs or outputs.
- The third stomach of a ruminant animal, an omasum.
- A polygon mesh representing the continuous, closed surface of a solid object
- A topological space that looks locally like the "ordinary" Euclidean space ℝⁿ and is Hausdorff.
verb
adv
adv
noun
- Crack cocaine.
- A tyre whose compound is softer than superhards, and harder than mediums.
- Hard labor.
- A firm or paved beach or slope convenient for hauling vessels out of the water.
adj
- In a physical form, not digital.
- Having a high energy (high frequency; short wavelength).
- Of silk: not having had the natural gum boiled off.
- Having a comparatively larger or a ninety-degree angle.
- Containing alcohol.
- Having disagreeable and abrupt contrasts in colour or shading.
- Made up of parallel rays, producing clearly defined shadows.
- Strong.
- Sexually aroused; having an erect penis.
- Difficult or requiring a lot of effort to do, understand, experience, or deal with.
- Severe, harsh, unfriendly, brutal.
- Unquestionable, unequivocal.
- Rigid in the drawing or distribution of the figures; formal; lacking grace of composition.
- Tough and muscular.
- High in dissolved chemical salts, especially those of calcium.
- Having the capability of being a permanent magnet by being a material with high magnetic coercivity (compare soft).
- Demanding a lot of effort to endure.
- Far, extreme.
- Velarized or plain, rather than palatalized.
- Of a market: having more demand than supply; being a seller's market.
- Using a manual or physical process, not by means of a software command.
- Hardened; having unusually strong defences.
- Having muscles that are tightened as a result of intense, regular exercise.
- Resistant to pressure.
- hardcore
- Plosive.
- Unvoiced.
noun
- A problem or difficult situation.
- Stuff, things.
- Solid excretory product evacuated from the bowels; feces.
- The act of shitting.
- Rubbish; worthless matter.
- Anything exceptional or remarkable.
- (in negations) Anything.
- Nonsense; bullshit.
- The smallest amount of concern or consideration.
- A strong rebuke.
- Any recreational drug (e.g. cannabis, heroin, etc.).
- A nasty, despicable person, used particularly of men.
- (the shit) The best of its kind.
verb
- To defecate.
- To excrete (something) through the anus.
- To fool or try to fool someone; to be deceitful.
- To annoy.
intj
- Used for mere emphasis; heck, hey.
- Used to show displeasure or surprise.
- Expression of worry, failure, shock, etc., often at something seen for the first time or remembered immediately before using this term.
adj
verb
- To say with difficulty.
- To become known.
- To leave a vehicle such as a car. (Note: for public transport, get off is more common.)
- To help (someone) leave.
- To spend free time out of the house.
- To remove or eliminate (dirt or stains).
- To come out of a situation; to escape a fate.
- To publish or make available; to disseminate.
- To take (something) from its container or storage place, so as to use or display it.
- To be released, especially from hospital or prison.
- To remove one's money from an investment; to end an investment.
- To leave or escape.
intj
verb
noun
- The collective discipline of study or learning acquired through the scientific method; the sum of knowledge gained from such methods and discipline.
- Knowledge derived from scientific disciplines, scientific method, or any systematic effort.
- Synonym of sweet science (“the sport of boxing”)
- The fact of knowing something; knowledge or understanding of a truth.
- Specifically the natural sciences.
- A particular discipline or branch of learning, especially one dealing with measurable or systematic principles rather than intuition or natural ability.
- The scientific community.
noun
- A difficult circumstance or problem.
- A type of syllogism of the form "if A is true then B is true; if C is true then D is true; either A or C is true; therefore either B or D is true".
- A circumstance in which a choice must be made between two or more alternatives that seem equally undesirable.
- Offering to an opponent a choice between two (equally unfavorable) alternatives.
noun
- A difficult task, especially one that the person making the attempt finds more enjoyable because of that difficulty.
- The act of appealing a ruling or decision of a court of administrative agency.
- An antagonization or instigation intended to convince a person to perform an action they otherwise would not.
- A bid to overcome something.
- The act of seeking to remove a judge, arbitrator, or other judicial or semi-judicial figure for reasons of alleged bias or incapacity.
- An act of seeking to have a certain person be declared not legally qualified to vote, made when the person offers their ballot.
- The act of a sentry in halting a person and demanding the countersign, or (by extension) the action of a computer system demanding a password, etc.
- A summons to fight a duel; also, the letter or message conveying the summons.
- An attempt to take possession; a tackle.
- An attempt to have a work of literature restricted or removed from a public library or school curriculum.
- The opening and crying of hounds upon first finding the scent of their game.
- A judge's interest in the result of a case, constituting grounds for them to not be allowed to sit the case (e.g., a conflict of interest).
verb
- To be difficult or challenging for.
- To question or demand the countersign from (one who attempts to pass the lines).
- To dare (someone).
- To invite (someone) to take part in a competition.
- To call something into question or dispute.
- To object to the reception of the vote of, e.g. on the ground that the person is not qualified as a voter.
- To take (a final exam) in order to get credit for a course without taking it.
- To make a formal objection to a juror.
- To dispute (something).
noun
- The profound part of a problem.
- A deep hole or pit, a water well; an abyss.
- A deep shade of colour.
- A silent time; quiet isolation.
- The deep part of a lake, sea, etc.
- A fielding position near the boundary.
- The sea, the ocean.
adj
- In a (specified) number of rows or layers.
- Positioned or reaching far, especially down through something or into something.
- Voluminous.
- Far in extent in another (non-downwards, but generally also non-upwards) direction away from a point of reference.
- Low in pitch.
- Far from the center of the playing area, near to the boundary of the playing area, either in absolute terms or relative to a point of reference.
- Distant in the past, ancient.
- Significant, not superficial, in extent.
- Muddy; boggy; sandy; said of roads.
- Extending far down from the top, or surface, to the bottom, literally or figuratively.
- Penetrating a long way, especially a long way forward.
- Hard to penetrate or comprehend; profound; intricate; obscure.
- Positioned back, or downfield, towards one's own goal, or towards or behind one's baseline or similar reference point.
- Thick.
- Profound, having great meaning or import, but possibly obscure or not obvious.
- Extending to a level or length equivalent to the stated thing.
- Highly saturated; rich.
- Sound, heavy (describing a state of sleep from which one is not easily awoken).
- Of penetrating or far-reaching intellect; not superficial; thoroughly skilled; sagacious; cunning.
adv
adj
- Overly and needlessly complicated.
- Embellished with figures and forms such that every level of relief gives way to more details and contrasts.
- Ornate, intricate, decorated, laden with detail.
- Chiseled from stone, or shaped from wood, in a garish, crooked, twisted, or slanted sort of way, grotesque.
- Complex and beautiful, despite an outward irregularity.
- Characteristic of Western art music of about the same period.
noun
noun
verb
- To take part in a wrestling match with someone
- To move or lift something with difficulty
- To struggle or strive
- To fight.
- To throw a calf etc in order to brand it
- To contend, with an opponent, by grappling and attempting to throw, immobilize or otherwise defeat him, depending on the specific rules of the contest
English words for 'A problem that is challenging to solve.'
As you may have noticed, above you will find words for "A problem that is challenging to solve.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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streamline
a branch of the descending aorta
Not patentable
doo-doo-doo
rough-hewn
steelworks
catchword
to ejaculate
classical style
waste treatment
hang
possibly.
diver propulsion vehicle dive
understaffed
index finger
nuptial
flexibly
hardened.
to exalt.
sister-in-law
well-liked
freshwater fish
agranulocytosis
ballistic missile defense
the best part.
thermohaline circulation
educated class
snipes
southeasterly.
urea
long novel
the Lord's Day
to act as an intermediary
world domination
to flood.
sun
seawall
Shinto priest
club moss
vain.
slip of the pen
select.
feeling awkward
to work hard
firm.
to cancel
interrogation
bug
exaggeration
to be exhausted