adamantine

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English - English
Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains
Like the diamond in hardness or luster
{a} made of or like adamant, hard
consisting of or having the hardness of adamant
having the hardness of a diamond
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"
{s} hard, tough; unyielding; having sparkle and luster like a diamond
having the hardness of a diamond consisting of or having the hardness of adamant
diamantine