"adamant" in the noun sense
1. diamond, adamant
very hard native crystalline carbon valued as a gem
"adamant" in the adjective sense
1. adamant, adamantine, inexorable, intransigent
impervious to pleas, persuasion, requests, reason she would have none of him"- W.Churchill
"he is adamant in his refusal to change his mind"
"Cynthia was inexorable
"an intransigent conservative opposed to every liberal tendency"
Source: WordNet® (An amazing lexical database of English)
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