gruelling Definition

grueling, arduous, toilsome, laborious, punishing, heavy, backbreaking, effortful, hard, labourious, exhausting, strenuous, tiring, tiresome, tough, draining, tedious, torturous, hectic, tortuous, wearisome, monotonous, stressful, lengthy, interminable, intense, hellish, intensive, unforgiving, brutal, tricky, agonising, moliminous, penultimate, weeklong, excruciating, eliminatory, pathless, harrowing, defatigable, enervating, frazzling, longspun, painable, toilful, chequered, forweary, exhilarating, fatigable, falklands, plough on, epic, favourite, sisyphean, sweaty, limbering, defatigate, transalpine, natterjack, microlite, draw out, unrested, bearable, palestric, masochistic, eventless, sleepless, painful, trampoose, overrigorous, leisurely, brrr, enthralling, fatiguing, windburned, uphill, laborless, nepalese, perpession, travailous, dureless, toughish, weariless, fag out, weariful, unsweat, tireling, difficult, protractile, unweary, onerous, defatigation, painstaking, limber up, ordalian, tormentful, exantlate, weariable, burdensome, weary,