adamantine -- (consisting of or having the hardness of adamant)
adamantine -- (having the hardness of a diamond)
adamant, adamantine, inexorable, intransigent -- (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")
(TTS Sound)
