1. diamond, adamant, carbon, C, atomic number 6, transparent gem

usage: very hard native crystalline carbon valued as a gem


1. adamant, adamantine, inexorable, intransigent, inflexible (vs. flexible)

usage: impervious to pleas, persuasion, requests, reason; "he is adamant in his refusal to change his mind"; "Cynthia was inexorable; she would have none of him"- W.Churchill; "an intransigent conservative opposed to every liberal tendency"

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