Definition of insane

The meaning of the word insane.

3 definitions of insane

- adjective
1. insane -- afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter"
antonyms: sane -- mentally healthy; free from mental disorder; "appears to be completely sane"
 
2. harebrained -- very foolish; "harebrained ideas"; "took insane risks behind the wheel"; "a completely mad scheme to build a bridge between two mountains"
synonyms: harebrained, mad
 
3. insane, mad -- mentally unsound
synonyms: mad, wud, daft, hyte, craze, crazy, unwit, dement, insaner, insanely, insanest
 
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