grueling

Synonyms

arduous, Augean, backbreaking, challenging, demanding, difficult, effortful, exacting, formidable, hard, heavy, herculean, killer, laborious, moiling, murderous, rigorous, rough, rugged, severe, stiff, strenuous, sweaty, tall, testing, toilsome, tough, uphill;

Antonyms

cheap, easy, effortless, facile, light, mindless, simple, soft, undemanding;

Near Antonyms

achievable, clear, doable, elementary, manageable, uncomplicated;

comforting, gentle, painless, relaxed, smooth, soothing;

accessible, friendly, idiotproof, user-friendly;

Related Words

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;

grievous, grim, strict, stringent;

brutal, cruel, inhuman, painful;