Definition of Adamant

Noun

• very hard native crystalline carbon valued as a gem
  diamond

Adjective

• 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"
  adamantine inexorable intransigent

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