Definition of adamant adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈædəmənt//
; NAmE NAmE//ˈædəmənt//
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determined not to change your mind or to be persuaded about something Eva was adamant that she would not come. The government remained adamant that there was no more money available. Word OriginOld English (as a noun), from Old French adamaunt-, via Latin from Greek adamas, adamant-, ‘untameable, invincible’ (later used to denote the hardest metal or stone, hence diamond), from a- ‘not’ + daman ‘to tame’.
See the Oxford Advanced American Dictionary entry: adamant