/ Dictionary / Index L laborious: Meaning and Definition of Find definitions for: la•bo•ri•ous Pronunciation: (lu-bôr'ē-us, -bōr'-), [key] — 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: laborious (Thesaurus) labor-intensive Laborism Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language