Definition of doubter noun from the Oxford Advanced Learner's Dictionary

 

doubter

 noun
noun
BrE BrE//ˈdaʊtə(r)//
 
; NAmE NAmE//ˈdaʊtər//
 
 
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a person who feels uncertain about something or does not believe that something is true or will happen He was determined to prove the doubters wrong.