impervious to pleas, persuasion, requests, reason; ; - W.Churchill; "he is adamant in his refusal to change his mind", "Cynthia was inexorable; she would have none of him", "an intransigent conservative opposed to every liberal tendency". Synonyms:adamantine, inexorable, intransigent.
very hard native crystalline carbon valued as a gem. Synonyms:diamond.
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