adamantine

Adjective
  1. Consisting of or having the hardness of adamant (synset 302613736)
  2. Having the hardness of a diamond (synset 301154749)
    similar to: hard - resisting weight or pressure
  3. Impervious to pleas, persuasion, requests, reason (synset 301028427)
    "he is adamant in his refusal to change his mind"; "Cynthia was inexorable; she would have none of him"; "an intransigent conservative opposed to every liberal tendency"
    similar to: inflexible - incapable of change
    same as: adamant, inexorable, intransigent

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