Definition of 'adamantine'
- consisting of or having the hardness of adamant
- having the hardness of a diamond
- 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: adamant inexorable intransigent