Synonyms to onerous

annoying, aggravating, aggravative, backbreaking, besetting, bothering, bothersome, burdensome, chafing, contentious, crushing, disquieting, distressful, distressing, disturbing, exasperating, exasperative, fretting, galling, grueling, harassing, heavy, hefty, importunate, importune, irking, irksome, irritating, oppressive, painful, pesky, pestering, pestiferous, pestilent, pestilential, plaguesome, plaguey, plaguing, provocative, provoking, teasing, tiresome, tormenting, troublesome, troubling, trying, upsetting, vexatious, vexing, wearisome, worrisome, worrying, arduous, Herculean, abrupt, abstruse, brutal, complex, critical, delicate, demanding, difficile, difficult, effortful, energetic, exacting, exhausting, fatiguing, forced, formidable, hairy, hard, intricate, jawbreaking, killing, knotted, knotty, labored, laborious, mean, no picnic, not easy, operose, precipitate, precipitous, punishing, rigorous, rough, rugged, set with thorns, severe, sheer, sideling, spiny, steep, stickle, strained, strenuous, taxing, thorn