arduous
difficult
hard
hard yards
rough sledding
hard time
strive
endeavor
endeavour
lightning in a bottle
marathonic
pull off
dead set
Herculean
difficulty
exert
difficultness
pull teeth
laborious
task
mission impossible
mindless
hardness
over the river and through the woods
ruggedness
backbreaker
striving
difficulty level
eke out
ambitious
strivingly
struggle
serious
manual
un-come-at-able
head-game
winning
pains
un-get-at-able
headgame
try as one may
ungetatable
nisus
hard-fought
strain
tew
brain-bending
break a sweat
mountain
daunting
endeavorment
effortful
operose
hardpressed
gruelling
effortfulness
heavy
toilsome
hard going
punishing
backbreaking
grueling
old college try
labour
strenuousness
study
laboring oar
tug
nonability
ineffective
put in the work
push
drive
bring off
labor
arduousness
heavy lifting
inefficient
come at
challenge
problematic
unattainable
pretentiously
an old dog for a hard road
blood, sweat and tears
induration
boss up
gun for
chase
put out
tryingness
arduous
difficult
hard
marathonic
Herculean
laborious
mindless
ambitious
serious
manual
un-come-at-able
un-get-at-able
ungetatable
hard-fought
brain-bending
daunting
effortful
operose
hardpressed
gruelling
heavy
toilsome
punishing
backbreaking
grueling
ineffective
inefficient
problematic
unattainable
strivingly
pretentiously
hard yards
rough sledding
hard time
lightning in a bottle
dead set
difficulty
difficultness
task
mission impossible
hardness
ruggedness
backbreaker
striving
difficulty level
struggle
head-game
winning
pains
headgame
nisus
strain
mountain
endeavorment
effortfulness
old college try
labour
strenuousness
study
laboring oar
nonability
arduousness
heavy lifting
challenge
blood, sweat and tears
induration
tryingness
strive
endeavor
endeavour
pull off
exert
pull teeth
eke out
tew
break a sweat
labour
tug
put in the work
push
drive
bring off
labor
come at
boss up
gun for
chase
put out
English words for 'difficult to accomplish; demanding considerable mental effort and skill'
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