American English

Definition of mad adjective from the Oxford Advanced American Dictionary



    (madder, maddest)
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  1. 1[not before noun] mad (at somebody) mad (about something) (informal) very angry He got mad and walked out. She's mad at me for being late. Thesaurusangrymad furious upset indignant irateThese words all describe people feeling and/or showing anger.angry feeling or showing anger:Please don't be angry with me. Thousands of angry demonstrators filled the square.mad [not before noun] (informal) very angry:He got mad and walked out. She's mad at me for being late.furious extremely angry:He was furious at having been taken out of the game. He was furious with her for ruining the party.upset somewhat angry or annoyed:I was quite upset with him for being late.indignant feeling or showing anger and surprise because you think that you or someone else has been treated unfairly:She was very indignant at the way she had been treated.irate very angry:irate customers an irate letterPatterns angry/mad/furious/upset/indignant about/at something angry/furious/upset with somebody (for doing something) angry/mad/furious/upset/indignant that to get angry/mad/furious/upset to make somebody angry/mad/furious
  2. 2done without thought or control; wild and excited The crowd made a mad rush for the exit. Only a mad dash got them to the meeting on time.
  3. 3having a mind that does not work normally; mentally ill They realized that he had gone mad. Inventors are not mad scientists. I'll go mad if I have to wait much longer. She seemed to have gone stark raving mad. A revolver is the only way to stop a mad dog.
  4. 4[not usually before noun] mad (about something/somebody) (informal) liking something or someone very much; very interested in something to be mad about tennis He's always been mad about kids. She's completely power-mad.
  5. 5(informal) very stupid; not at all sensible You must be mad to risk it. It was a mad idea. compare crazy
  6. Idioms
    hopping mad (informal)
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    very angry
    like crazy/mad (informal)
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    very fast, hard, much, etc. I had to run like mad to catch the bus.
    (as) mad as a hatter/a March hare (informal)
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    (of a person) mentally ill; very silly From the Mad Hatter, a character in Lewis Carroll's Alice's Adventures in Wonderland. Because of the chemicals used in hat-making, workers often suffered from mercury poisoning, which can cause loss of memory and damage to the nervous system. A March hare was called mad because of the strange behavior of hares during the mating season.