adamant
/ˈæ.də.mænt/
/ˈæ.də.mænt/
noun
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An imaginary rock or mineral of impenetrable hardness; a name given to the diamond and other substances of extreme hardness.
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An embodiment of impregnable hardness.
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A lodestone.
adjective
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(said of people and their conviction) Firm; unshakeable; unyielding; determined.
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(of an object) Very difficult to break, pierce, or cut.