adamantine

1. (satellite adjective) having the hardness of a diamond

2. (adjective) consisting of or having the hardness of adamant

3. (satellite 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



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