Synonyms of onerous in English:

onerous


See US English definition of onerous

See UK English definition of onerous

See Spanish definition of pesado

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