Did you know?

Click any word in a definition or example to find the entry for that word

mistaken - definition and synonyms


What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.



Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

adjective     mistaken pronunciation in American English
  1. 1
    [never before noun] if someone is mistaken, they are wrong about something
    mistaken about:

    He may have been mistaken about what he saw.

    be mistaken in (doing) something:

    She is mistaken in thinking that the report was written last year.

    sadly mistaken:

    If you think I’m going to help, you’re sadly mistaken.

  2. 2
    a mistaken belief, idea, opinion, etc. is not correct

    He was under the mistaken impression that I liked him.

derived word


     mistakenly pronunciation in American English

He mistakenly believed that she was married.

quiz invitation


a description of an economic or political situation based on analysis of information at the present time

BuzzWord Article

Open Dictionary


an unregulated form of capitalism that features financial deregulation, privatisation and low tax for high earners

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play