Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains.
source: Webster 1913
adjective satellite
having the hardness of a diamond
source: WordNet 3.0
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. An intransigent conservative opposed to every liberal tendency.
