1. [adjective] consisting of or having the hardness of adamant

  2. [adjective] having the hardness of a diamond

  3. [adjective] not capable of being swayed or diverted from a course; unsusceptible to persuasion; "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 tendancy"
    Synonyms: adamant, inexorable, intransigent