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1. Requiring labor, perseverance, or sacrifices; toilsome; tiresome. 2. Devoted to labor; diligent; industrious; as, a laborious mechanic. 3. 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" 
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