- a rock or mineral imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness
- an embodiment of impregnable hardness
- lodestone; magnet
Etymology: From adamantem, accusative singular form of adamas "hard as steel", from Ancient Greek < (polytonic, á) (adamas) "invincible", from (polytonic, á-) (a-) "not" + (polytonic, ) (damazo) "I tame".
- resistant to reason; determined; inflexible; unshakeable; unyielding
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