Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “crazy”

crazy

adjective uk   /ˈkreɪ.zi/ us  

crazy adjective (NOT SENSIBLE)

A2 stupid or not reasonable: It's a crazy idea. You're crazy to buy a house without seeing it. mentally ill: I seriously think she'll go crazy if she doesn't have a holiday soon.

crazy adjective (ANGRY)

B2 annoyed or angry: The constant noise drove me crazy (= made me become angry).
crazily
adverb uk   /-zɪ.li/ us  
craziness
noun [U] uk   /-nəs/ us  

crazy

noun [C] uk   /ˈkreɪ.zi/ US slang us  
a person who behaves in a way that is stupid or not reasonable, especially one who is mentally ill: There's some old crazy over there shouting and spitting at people.
(Definition of crazy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of crazy?
Browse related topics

You are looking at an entry to do with Of unsound mind, but you might be interested in these topics from the Psychology, psychiatry, & psychoanalysis topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “crazy” in other dictionaries

Word of the Day

shadow

an area of darkness, caused by light being blocked by something

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