Definition of adamant adjective from the Oxford Advanced American Dictionary

 

adamant

 adjective
adjective
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.
adamantlyadverb
 
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His family was adamantly opposed to the marriage.
See the Oxford Advanced Learner's Dictionary entry: adamant