onerous
adjective
[ ˈəʊn(ə)rəs ]
• (of a task or responsibility) involving a great deal of effort, trouble, or difficulty.
• "he found his duties increasingly onerous"
Similar:
burdensome,
heavy,
inconvenient,
troublesome,
awkward,
crushing,
back-breaking,
oppressive,
weighty,
arduous,
strenuous,
uphill,
difficult,
hard,
severe,
formidable,
laborious,
Herculean,
exhausting,
tiring,
taxing,
demanding,
punishing,
gruelling,
exacting,
wearing,
stiff,
stressful,
wearisome,
fatiguing,
toilsome,
exigent,
Origin:
late Middle English: from Old French onereus, from Latin onerosus, from onus, oner- ‘burden’.
