Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “crazy”

crazy

adjective    /ˈkreɪ·zi/
very strange or foolish: She’s the craziest person I’ve ever met. [+ to infinitive] You’re crazy to rent the place without seeing it first. Crazy can mean mentally ill. Crazy can also mean behaving in a strange way esp. because of stress, as if you are mentally ill: The constant whine of the machine nearly drove (= made) me crazy. I think she’ll go (= become) crazy if she doesn’t take a vacation soon. crazily    /ˈkreɪ·zə·li/ adverb [not gradable] craziness    /ˈkreɪ·zi·nəs/ noun [U]
(Definition of crazy adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on 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:

Definitions of “crazy” in other dictionaries

Word of the Day

work out

to exercise in order to improve the strength or appearance of your body

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More