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Definition of adamant adjective in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Adamant means unyielding, inflexible, or hard. It can also refer to a legendary stone or a gemstone. Find out more about its origin, usage, and translations in different languages. Adamant means unshakable in purpose, determination, or opinion; unyielding. It can also refer to a hard or unbreakable substance or a legendary stone. Learn more about its origin, usage, and related words. The meaning of ADAMANT is unshakable or insistent especially in maintaining a position or opinion : unyielding. How to use adamant in a sentence. The Meaning and History of Adamant Synonym Discussion of Adamant .