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The definition of insanity

3 Definitions of: insanity

1. noun, relatively permanent disorder of the mind; state or condition of being insane
2. noun, law a defect of reason as a result of mental illness, such that a defendant does not know what he or she is doing or that it is wrong
3. noun, utter folly; stupidity
4. Show me some examples of this word: insanity
5. Show me the etymology of the word: insanity

Synonyms:	folly, preposterous, madness, mental illness, dementia, aberration, delirium, crazy, stupidity, lunacy	And more...
Antonyms:	sanity, sense

From Collins