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WordReference Random House Learner's Dictionary of American English © 2024la•bo•ri•ous /ləˈbɔriəs/USA pronunciation adj. - requiring much work or effort;
needing much work;
difficult;
hard;
arduous:a laborious undertaking.
la•bo•ri•ous•ly, adv. See -lab-. WordReference Random House Unabridged Dictionary of American English © 2024la•bo•ri•ous (lə bôr′ē əs, -bōr′-),USA pronunciation adj. - requiring much work, exertion, or perseverance:a laborious undertaking.
- characterized by or requiring extreme care and much attention to detail:laborious research.
- characterized by or exhibiting excessive effort, dullness, and lack of spontaneity;
labored:a strained, laborious plot. - given to or diligent in work:a careful, laborious craftsman.
- Latin labōriōsus. See labor, -ious
- Middle English 1350–1400
- 1.See corresponding entry in Unabridged toilsome, arduous, onerous, burdensome, difficult, hard, tiresome, wearisome, fatiguing.
- 4.See corresponding entry in Unabridged hardworking, industrious, assiduous, sedulous, painstaking.
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