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English definition of “mistaken”

mistaken

adjective uk   /mɪˈsteɪ.kən/ us  
C1 wrong in what you believe, or based on a belief that is wrong: If you think you can carry on drinking so much without damaging your health, then you're mistaken. I'm afraid I was mistaken about how much it would cost. The negotiations continued in the mistaken belief that a peaceful agreement could be reached. a case of mistaken identity
mistakenly
adverb uk   /-li/ us  
She mistakenly believed that she could get away with not paying her taxes.
(Definition of mistaken from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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