Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “headcase”

headcase

noun [C] uk   /ˈhed.keɪs/ UK informal us  
a person who behaves strangely or who is very silly or violentOf unsound mindStupid and sillyStupid and silly people
(Definition of headcase from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of headcase?
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

Translations of “headcase”

Word of the Day

scrumpy

an alcoholic drink made from apples

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