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Definition of laborious: 1. Devoted to labor; diligent; industrious; as, a laborious mechanic.
2. Requiring labor, perseverance, or sacrifices; toilsome; tiresome.

Synonyms:

exacting, great, large, weighty, grueling, sullen, taxing, punishing, exhausting, active, straining, indefatigable, enceinte, labored, ponderous, sound, impenetrable, grave, heavy, overweight, diligent, backbreaking, cloggy, fleshy, unvoiced, threatening, voiceless, surd, knockout, operose, easy, rigorous, sonorous, with child, serious, dense, exigent, wakeless, effortful, profound, lowering, labourious, gravid, tall, concentrated, clayey, expectant, intemperate, laboured, leaden, gruelling, big, assiduous, lumbering, strong, weighed down, grievous

working, laboring, toiling

bothersome, contrary, harsh, cantankerous, complicated, tough, finicky, stiff, hard, demanding, toilsome, arduous, difficult, adverse, trying, formidable, stressful, burdensome, fussy, ticklish, tricky, grinding, troublesome, rough, wearisome, strenuous, cumbersome, thorny, tight, wearing, rugged, uphill, wearying, onerous, complex, severe, oppressive, knotty