/ Dictionary / Index A adamant: Meaning and Definition of Find definitions for: ad•a•mant Pronunciation: (ad'u-munt, -mant"), [key] — adj. utterly unyielding in attitude or opinion in spite of all appeals, urgings, etc. too hard to cut, break, or pierce. —n. any impenetrably or unyieldingly hard substance. a legendary stone of impenetrable hardness, formerly sometimes identified with the diamond. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: adamant (Thesaurus) Adam-and-Eve adamantane Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language