adamantine

Adjective
Synonyms: adamantinexorableintransigent

WordNet 3.0

Adjective (3)

  1. consisting of or having the hardness of adamant
  2. having the hardness of a diamond
  3. impervious to pleas, persuasion, requests, reason“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 tendency”Synonyms: adamantinexorableintransigent
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Webster's Dictionary (GCIDE)

Adamantine \Ad`a*man"tine\, a. [L. adamantinus, Gr. ?.]

1.Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains. [1913 Webster]

2.(Min.) Like the diamond in hardness or luster. [1913 Webster]

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