adjective
refusing to be persuaded or to change one's mind
固执的，执拗的
he is adamant that he is not going to resign.
他很固执不打算辞职。
noun
[mass noun](archaic)a legendary rock or mineral to which many, often contradictory, properties were attributed, formerly associated with diamond or lodestone
(古)硬石，刚玉

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派生
adamance
noun
adamancy
noun
adamantly
adverb

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语源
Old 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'. The phrase to be adamant dates from the 1930s, although adjectival use had been implied in such collocations as ‘an adamant heart’ since the 16th cent