Synonyms of onerous in English:
1 the job had become onerous
burdensome, arduous, strenuous, difficult, hard, severe, heavy, back-breaking, oppressive, weighty, uphill, challenging, formidable, laborious, Herculean, exhausting, tiring, taxing, demanding, punishing, grueling, exacting, wearing, wearisome, fatiguing
[Antonyms] effortless, easy
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