Englishonerous
adjective
the task proved to be more onerous than she had expected:
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.
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onerous Oxford Dictionary of English