1
[ adjective ] having the hardness of a diamond

Related terms

hard

2
[ adjective ] consisting of or having the hardness of adamant

Related terms

diamond

3
[ adjective ] not capable of being swayed or diverted from a course; unsusceptible to persuasion

Examples

"he is adamant in his refusal to change his mind" "Cynthia was inexorable she would have none of him"- W.Churchil

Related terms

inflexible

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