grueling Definition

arduous, gruelling, laborious, punishing, backbreaking, toilsome, hard, heavy, effortful, labourious, exhausting, strenuous, torturous, tortuous, hectic, excruciating, daunting, toughest, intense, rigorous, brutal, harrowing, stressful, intensive, lengthy, tedious, challenging, weeklong, agonizing, uphill, unforgiving, hellish, exhilarating, monotonous, thrilling, frenetic, yearlong, painstaking, perilous, treacherous, sisyphean, herculean, roughest, enervating, eventful, rockiest, interminable, hellacious, epic, relentless, painful, ferocious, bumpy, protracted, fierce, unrelenting, wrenching, wearisome, enthralling, difficult, torrid, tricky, fittest, tumultuous, frustrating, daylong, vigorous, monthlong, exhaustive, rancorous, scorching, riveting, frantic, invigorating, humbling, acrimonious, attritional, gutsy, humid, exacting, regimented, winded, merciless, fatiguing, hourlong, final, hour, tiresome, leisurely, demoralizing, contentious, miserable, exasperating, tense, hilly, frenzied, humiliating, weary, sweaty, joyless,