mad - definition and synonyms


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  1. 1
    very silly or stupid

    You’ll think I’m mad – I’ve just left my job.

    be mad to do something:

    You’re mad to spend so much money on clothes.

    1. a.
      informal tending to behave in a strange way that other people sometimes consider funny

      a mad scientist

       Synonyms and related words
    2. b.
      informal an offensive way for describing someone who is mentally ill

      She was completely mad.

  2. 2
    [never before noun] informal angry

    He makes me mad, the way he keeps criticizing me all the time.

    mad at/with:

    My boss is mad with me for missing the meeting.

  3. 3
    done quickly or without thinking, in a way that is badly organized

    There were people everywhere – it was all a bit mad!

    a mad rush/dash:

    It was a mad rush to get the job finished.

  4.   From our crowdsourced Open Dictionary
    mad as a wet hen extremely angry

    Mom will be mad as a wet hen if we don't get home soon.

    Submitted by Monnshine on 27/07/2015
  5.   From our crowdsourced Open Dictionary
    (as) mad as hell a rude phrase meaning "extremely angry"

    Your dad will be as mad as hell when he finds out you took his car.

    I will be mad as hell if he gets here late.

    Submitted by Caleb Judy from United States on 17/12/2015