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The definition of insane

3 Definitions of: insane

1. adjective, a) mentally deranged; crazy; of unsound mind b) (as collective noun; preceded by the)
2. adjective, characteristic of a person of unsound mind
3. adjective, irresponsible; very foolish; stupid
4. Show me some examples of this word: insane
5. Show me the etymology of the word: insane

Synonyms:	preposterous, daft (informal), mad, crazy, nuts (slang), cracked (slang), mental (slang), barking (slang), crackers (Brit. slang), craze	And more...
Antonyms:	reasonable, sane

From Collins