'Laborious' definitions:

Definition of 'laborious'

From: WordNet
adjective
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]

Definition of 'Laborious'

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