- Made of adamant, or having the qualities of adamant;
incapable of being broken, dissolved, or penetrated; as, adamantine
bonds or chains. - Like the diamond in hardness or luster.
Meaning of 'adamantine' (Princeton's WordNet)
1 . adamantine
[ s]
Meaning (1): - impervious to pleas, persuasion, requests, reason
Example in sentence:
an intransigent conservative opposed to every liberal tendency;
Cynthia was inexorable; she would have none of him;