Did you know?

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

mental - 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     mental pronunciation in British English
  1. 1
    [only before noun] existing in the mind

    It is clear that mental activity does not stop when we’re asleep.

    mental picture/image:

    I had a complete mental picture of the building I wanted to create.

  2. 2
    informal old-fashioned mentally ill
    1. a.
      offensive crazy or stupid

derived word


     mentally pronunciation in British English

He was in good health both physically and mentally.

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