/ mɪˈsteɪkən; NAmE / adjective
1.
[ not usually before noun ] mistaken (about sb/sth) wrong in your opinion or judgement :
You are completely mistaken about Jane.
Unless I'm very much mistaken, that's Paul's wife over there.
2.
based on a wrong opinion or bad judgement
SYN misguided :
mistaken views / ideas
I told her my secret in the mistaken belief that I could trust her.
► mis·taken·ly adverb :
He mistakenly believed that his family would stand by him.