/ Dictionary / Index I iron-hearted: Meaning and Definition of Find definitions for: i•ron-heart•ed Pronunciation: (ī'urn-här'tid), [key] — adj. cruel; heartless; unfeeling. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. iron hat iron horse Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language