Synonyms and Antonyms of arduous
- climbing Mount Everest is an arduous, exhausting challenge
Augean, backbreaking, challenging, demanding, difficult, effortful, exacting, formidable, grueling (or gruelling), hard, heavy, hellacious, herculean, killer, laborious, moiling, murderous, pick-and-shovel, rigorous, rough, rugged, severe, stiff, strenuous, sweaty, tall, testing, toilsome, tough, uphill
abstract, abstruse, complex, complicated, elusive, hairy, insoluble, intricate, involved, knotty, opaque, problematic (also problematical), recondite, serious, spiny, stubborn, thorny, ticklish, tricky
bruising, burdensome, exhausting, labored, onerous, oppressive, stressful, taxing, tight, trying
annoying, bothersome, distressing, irksome, troublesome, vexatious
cheap, easy, effortless, facile, light, mindless, simple, soft, undemanding
- the arduous task of doing the research for my term paper
burdensome, challenging, demanding, exacting, grueling (or gruelling), killing, laborious, onerous, persnickety, taxing, toilsome
easy, effortless, facile, simple, smooth