/ Dictionary / Index H heartless: Meaning and Definition of Find definitions for: heart•less Pronunciation: (härt'lis), [key] — adj. unfeeling; unkind; unsympathetic; harsh; cruel: heartless words; a heartless ruler. lacking courage or enthusiasm; spiritless; disheartened. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heartless (Thesaurus) heartland heart-lung machine Related Content Daily Word Quiz: sublime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language