hard going
task
snorter
megachallenge
overchallenge
superdifficult
harder than Chinese math
fiendish
mountainous
hard as Chinese algebra
murderous
mission impossible
torrid
mean
difficult
pull teeth
lightning in a bottle
toughness
taxing
hard as iron
ambitious
challenging
mountain to climb
tall
uphill
hardish
superchallenge
testing
hard-fought
rigour
daunting
flounder
nodus
bring off
Herculean
semihard
enmesh
Nintendo hard
complicated
formidability
dys-
up the ante
tough
heavy lifting
problem
trouble
effortful
mountain
killer
challenge
uneasy
boil the ocean
arduous
Matterhorn
overtedious
big
tough as nails
put a hurt on
grind
everything
rough
hard
hard yards
praemunire
torfer
Sisyphean
induration
ultrahard
an old dog for a hard road
struggle
rigmarole
pain point
come at
eke out
difficulty
tough as teak
skittish
hard sledding
catch a cold
tough nut to crack
rough sledding
pig
rub
three-pipe problem
situation
overhard
with difficulty
hard nut to crack
hard times
bitch
hard time
get into trouble
doo-doo
superdifficult
harder than Chinese math
fiendish
mountainous
hard as Chinese algebra
murderous
torrid
mean
difficult
taxing
hard as iron
ambitious
challenging
tall
uphill
hardish
testing
hard-fought
daunting
Herculean
semihard
Nintendo hard
complicated
tough
effortful
uneasy
arduous
overtedious
tough as nails
rough
Sisyphean
ultrahard
tough as teak
skittish
hard
overhard
big
uphill
hard
task
snorter
megachallenge
overchallenge
mission impossible
lightning in a bottle
toughness
mountain to climb
superchallenge
rigour
nodus
formidability
heavy lifting
problem
trouble
mountain
killer
challenge
grind
hard yards
praemunire
torfer
induration
struggle
rigmarole
pain point
difficulty
hard sledding
tough nut to crack
rough sledding
pig
rub
three-pipe problem
situation
hard nut to crack
hard times
bitch
hard time
doo-doo
pull teeth
flounder
bring off
enmesh
up the ante
challenge
boil the ocean
put a hurt on
come at
eke out
catch a cold
get into trouble
English words for 'Difficult and requiring a lot of effort.'
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