Etymology
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adamantine (adj.)

"made of adamant; having the qualities of adamant" (hard, unyielding, unbreakable, inflexible), c. 1200, from Latin adamantinus "hard as steel, inflexible," from Greek adamantinos "hard as adamant," from adamas (genitive adamantos) "unbreakable, inflexible," as a noun, "hardest material" (see adamant (n.)).

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Definitions of adamantine

adamantine (adj.)
consisting of or having the hardness of adamant;
adamantine (adj.)
having the hardness of a diamond;
adamantine (adj.)
impervious to pleas, persuasion, requests, reason; "Cynthia was inexorable; she would have none of him"- W.Churchill;
From wordnet.princeton.edu