adj. hard, tough; unyielding; having sparkle and luster like a diamond

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Adjective
1. consisting of or having the hardness of adamant
(pertainym) diamond, adamant
2. having the hardness of a diamond
(similar) hard
3. not capable of being swayed or diverted from a course; unsusceptible to persuasion; "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 tendancy"
(synonym) adamant, inexorable, intransigent
(similar) inflexible

adj. adamant, unyielding, immovable

adj. adamantine, adamant, hard, unyielding