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3 definitions found
 for laborious
From The Collaborative International Dictionary of English v.0.48 :

  Laborious \La*bo"ri*ous\, a. [L. laboriosus, fr. labor labor:
     cf. F. laborieux.]
     1. Requiring labor, perseverance, or sacrifices; toilsome;
        [1913 Webster]
              Dost thou love watchings, abstinence, or toil,
              Laborious virtues all? Learn these from Cato.
        [1913 Webster]
     2. Devoted to labor; diligent; industrious; as, a laborious
        [1913 Webster] -- La*bo"ri*ous*ly, adv. --
        La*bo"ri*ous*ness, n.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adj 1: characterized by 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" [syn: arduous,
             backbreaking, grueling, gruelling, hard, heavy,
             laborious, operose, punishing, toilsome]

From Moby Thesaurus II by Grady Ward, 1.0 :

  103 Moby Thesaurus words for "laborious":
     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

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