Insane - Definition, Meaning & Synonyms

To be insane is to have a seriously disordered state of mind. This is also a slang word for acting wacky or wild.
This word has two closely related meanings. People who are insane are suffering from a seriously irrational or disordered state of mind. When someone commits a crime, it's important to know if they were sane or insane. If they're insane, the penalty is different. Many uses of the word are not so serious. A wild party is called insane, and car salesmen say their prices are insane. A teacher assigning six hours of homework might be told That’s insane!

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Insanity

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Insanity