Synonyms of onerous in English:

onerous


See definition of onerous

adjective

1‘the task proved to be more onerous than she had expected’

SYNONYMS

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

archaic toilsome

rare exigent

ANTONYMS

easy, effortless