Synonyms for adamant Found 4 synonyms across 2 meanings for “adamant”. very hard native crystalline carbon valued as a gem (noun) diamond impervious to pleas, persuasion, requests, reason (adj) adamantineinexorableintransigent Explore Related Words Rhymes with adamantSynonyms for diamondSynonyms for adamantineSynonyms for inexorableSynonyms for intransigent Synonym Finder | Rhyme Finder | Poetry Editor