Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “mad”

mad

adjective uk   /mæd/ (madder or maddest) us  

mad adjective (MENTALLY ILL)

B1 mentally ill, or unable to behave in a reasonable way: I think I must be going mad. Do I look like some mad old woman in this hat?

mad adjective (SILLY)

B1 mainly UK informal (US usually crazy) extremely silly or stupid: [+ to infinitive] You're mad to walk home alone at this time of night. He must be mad spending all that money on a coat. Some of the things she does are completely mad.
See also

mad adjective (ANGRY)

A2 [after verb] informal very angry or annoyed: He's always complaining and it makes me so mad.mainly US Are you still mad at me?mainly UK Kerry got really mad with Richard for not doing the washing up. Bill's untidiness drives me mad.

mad adjective (HURRYING)

[before noun] hurrying or excited and not having time to think or plan: We made a mad dash for the train. I was in a mad panic/rush trying to get everything ready.

mad adjective (ENTHUSIASTIC)

be mad about sb/sth B1 informal to love someone or something: He's the first real boyfriend she's had and she's mad about him. He's mad about football. be mad for sb/sth UK informal to want someone or something very much, or to be very interested in someone or something: Everyone's mad for him and I just don't see the attraction.
(Definition of mad adjective from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of mad?
Add Cambridge dictionaries to your browser to your website

Definitions of “mad” in other dictionaries

Word of the Day

see the light of day

When something sees the light of day, it appears for the first time.

Word of the Day

Highly delighted, bitterly disappointed, ridiculously cheap: adverbs for emphasis.

by Liz Walter,
October 22, 2014
We often make adjectives stronger by putting an adverb in front of them. The most common ones are very and, for a stronger meaning, extremely: He was very pleased. The ship is extremely large. However, we don’t use very or extremely for adjectives that already have a strong meaning, for example fantastic,

Read More 

life tracking noun

October 20, 2014
the use of one or more devices or apps to monitor health, exercise, how time is spent, etc.

Read More