onerous

Synonyms of ONEROUS

adjective

irksome, grievous, heartbreaking

burdensome, demanding, serious, exacting, galling, exigent, troublesome

rigourous, vexatious, harsh, painful, afflictive

grinding, laborious, strenuous, tedious, hard, arduous, gruelling

overpowering, crushing, excessive, merciless, taxing, fatiguing, intolerable