arduous
adjective
[ ˈɑːdjʊəs ]
• involving or requiring strenuous effort; difficult and tiring.
• "an arduous journey"
Similar:
onerous,
taxing,
difficult,
hard,
heavy,
laborious,
burdensome,
strenuous,
vigorous,
back-breaking,
stiff,
uphill,
relentless,
Herculean,
demanding,
trying,
tough,
challenging,
formidable,
exacting,
exhausting,
wearying,
fatiguing,
tiring,
punishing,
gruelling,
grinding,
intolerable,
unbearable,
murderous,
harrowing,
killing,
no picnic,
knackering,
toilsome,
exigent,
Origin:
mid 16th century: from Latin arduus ‘steep, difficult’ + -ous.
