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

wave

to raise your hand and move it from side to side as a way of greeting someone, telling someone to do something, or adding emphasis to an expression

Word of the Day

Come on – you can do it! Phrasal verbs with ‘come’.

by Liz Walter​,
November 19, 2014
As part of an occasional series on the tricky subject of phrasal verbs, this blog looks at ones formed with the verb ‘come’. If you are reading this blog, I’m sure you already know come from, as it is one of the first things you learn in class: I come from Scotland/Spain.

Read More 

silver splicer noun

November 17, 2014
informal a person who marries in later life Newly retired and now newlywed – rise of the ‘silver splicers’ Reaching pension age becomes a trigger to tie the knot as baby-boomers begin to redefine retirement

Read More