Adamantine
WordNet

adjective


(1)   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"
(2)   Having the hardness of a diamond
(3)   Consisting of or having the hardness of adamant
WiktionaryText

Adjective



  1. Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains.
  2. Like the diamond in hardness or luster.

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