/ Dictionary / Index L lethargy: Meaning and Definition of Find definitions for: leth•ar•gy Pronunciation: (leth'ur-jē), [key] — pl. -gies. the quality or state of being drowsy and dull, listless and unenergetic, or indifferent and lazy; apathetic or sluggish inactivity. an abnormal state or disorder characterized by overpowering drowsiness or sleep. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lethargy (Thesaurus) lethargize Lethbridge Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language