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Grueling
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Thesaurus
Herculean
annoying
arduous
backbreaking
besetting
bothersome
burdensome
castigatory
chastening
chastising
corrective
crushing
devitalizing
disciplinary
draining
effortful
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exhausting
fatiguesome
fatiguing
forced
hard-earned
hard-fought
heavy
hefty
inflictive
irksome
killing
labored
laborious
onerous
operose
oppressive
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penal
penological
plaguey
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punitive
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sapping
strained
straining
strenuous
stressful
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tiring
toilsome
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trying
uphill
vexatious
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weariful
wearing
wearisome
wearying
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