adjective

(of a task or responsibility) involving a great deal of effort, trouble, or difficulty. "he found his duties increasingly onerous" синонимы: 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