- very hard native crystalline carbon valued as a gem
- 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"
- She was quite adamant that she would not come.
- She was adamant in refusing to comply with his wishes.
- She became as rigid as adamant.
- adamant:adamant adj. 坚硬的…