/ Dictionary / Index L lassitude: Meaning and Definition of Find definitions for: las•si•tude Pronunciation: (las'i-td", -tyd"), [key] — n. weariness of body or mind from strain, oppressive climate, etc.; lack of energy; listlessness; languor. a condition of indolent indifference: the pleasant lassitude of the warm summer afternoon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lassitude (Thesaurus) lassie lasso Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language