laborious

adj. tiresome, exhausting; hard, strenuous; constrained; dull, without spontaneity; industrious, diligent; careful and attentive to detail

Adjective
1. characterized by toilsome effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace"
(synonym) arduous, backbreaking, grueling, gruelling, hard, heavy, punishing, toilsome
(similar) effortful

(a.)
Requiring labor, perseverance, or sacrifices; toilsome; tiresome.
  

(a.)
Devoted to labor; diligent; industrious; as, a laborious mechanic.
  

adj.
1. toilsome
محنت طلب, دشوار, سخت
2. industrious
محنتي, کميرا, محنت کش, جفاکش

Synonyms and related words:
Herculean, abstruse, ardent, arduous, assiduous, backbreaking, brutal, burdensome, careful, complex, critical, crushing, delicate, demanding, detailed, determined, difficile, difficult, diligent, dogged, effortful, energetic, exacting, exhausting, exhaustive, fatiguing, fervent, forced, formidable, grueling, hairy, hard, hard-earned, hard-fought, hard-working, hardworking, heavy, hefty, indefatigable, industrious, intricate, jawbreaking, killing, knotted, knotty, labored, mean, never idle, no picnic, not easy, obdurate, obstinate, onerous, operose, oppressive, overworked, painful, painstaking, persevering, persistent, ponderous, punishing, relentless, rigorous, rough, rugged, scrupulous, sedulous, set with thorns, severe, sleepless, spiny, steadfast, steady, steep, stiff, strained, strenuous, stubborn, taxing, thorny, thorough, ticklish, tireless, tiring, toilsome, tough, tricky, troublesome, unflagging, unrelenting, unremitting, unsleeping, unsparing, untiring, unwavering, unwearied, uphill, vehement, wearisome, wearying, wicked, zealous