Dictionary![]() ![]() ad•a•mantPronunciation: (ad'u-munt, -mant"), [key] —adj. 1. utterly unyielding in attitude or opinion in spite of all appeals, urgings, etc. 2. too hard to cut, break, or pierce. —n. 1. any impenetrably or unyieldingly hard substance. 2. a legendary stone of impenetrable hardness, formerly sometimes identified with the diamond. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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