/ Dictionary / Index L lackadaisical: Meaning and Definition of Find definitions for: lack•a•dai•si•cal Pronunciation: (lak"u-dā'zi-kul), [key] — adj. without interest, vigor, or determination; listless; lethargic: a lackadaisical attempt. lazy; indolent: a lackadaisical fellow. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lackadaisical (Thesaurus) lack lackaday Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language