Словарь синонимов английского языка - laborious

(adj) 1. arduous, burdensome, onerous, strenuous, gruelling, back-breaking, Herculean, exhausting, taxing, tiring, fatiguing, wearying, wearisome, toilsome, difficult, tough, hard, uphill, stiff: Few realize how laborious farm work can be. 2. painstaking, detailed, careful, thorough, diligent, scrupulous, exhaustive, steady, steadfast, belentless, unrelenting, dogged, assiduous, sedulous, persevering, persistent, untiring, tireless, indefatigable, unremitting: After laborious research the virus was finally identified. 3. industrious, hard-working, dogged, determined, unwavering, obstinate, stubborn, unflagging, obdurate: He made a laborious effort to get ahead. 4. laboured, strained, forced, ponderous, overworked: The book contains some of the mosd laborious prose ever written.