grueling, laborious, tortuous, exhausting, tedious, torturous, strenuous, painstaking, daunting, lengthy, difficult, toilsome, cumbersome, complicated, hectic, intensive, stressful, painful, excruciating, onerous, challenging, sisyphean, rigorous, exhaustive, tricky, bumpy, costly, gruelling, perilous, interminable, protracted, backbreaking, frustrating, labor intensive, eventful, unrewarding, tiresome, wearisome, agonizing, circuitous, messy, uphill, monotonous, intense, fruitless, treacherous, exasperating, harrowing, burdensome, consuming, expensive, contentious, futile, exhilarating, inconvenient, thankless, winded, herculean, exacting, anticlimactic, rocky, enervating, convoluted, unforgiving, acrimonious, unpleasant, hellish, yearlong, unfruitful, uneventful, rewarding, unwieldy, impossible, tough, prohibitive, dicey, brutal, vigorous, meticulous, doable, fitful, problematic, roughest, uneven, easy, wrenching, persevering, tumultuous, rancorous, improbable, labyrinthine, unglamorous, worthwhile, thorny, successful, chaotic, problematical, bearable, troublesome, inhospitable, humbling, joyless, fatiguing, timeconsuming, hazardous, irksome, profitless, racking

arduously, ball-breaker, ball-buster, drudging, endurance contest, laboring, labouring, marathon, toiling, trekker

backbreaking, difficult, effortful, grueling, gruelling, hard, heavy, laborious, labourious, punishing, straining, strenuous, toilsome