very hard native crystalline carbon valued as a gem 유의어: diamond,
형용사
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" 유의어: adamantine, inexorable, intransigent,