Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “insane”

insane

adjective
 
 
/ɪnˈseɪn/
ILL seriously mentally ill: a hospital for the criminally insane Mental and psychiatric disordersOf unsound mindStupid and silly
STUPID very silly or stupid: an insane decisionStupid and sillyOf unsound mind
insanely adverb
(Definition of insane from the Cambridge Learners Dictionary © Cambridge University Press)
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 “insane” in other dictionaries

Word of the Day

bright spark

a person who is intelligent, and full of energy and enthusiasm

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