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adj. Not willing to change one's opinion, purpose, or principles; unyielding. n. 1. A stone once believed to be impenetrable in its hardness. 2. An extremely hard substance. [From Middle English, a hard precious stone, from Old French adamaunt, from Latin adamās, adamant-, from Greek, unconquerable, hard steel, diamond; see demə- in the Appendix of Indo-European roots.] ada·mance, ada·man·cy n. ada·mant·ly adv. |
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