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1. Dictionary

   In·san·i·ty

   /inˈsanədē/

   

   noun

   • 1. the state of being seriously mentally ill; madness: "he suffered from bouts of insanity" Similar mental illnessmental disordermental derangementmadnessinsanenessdementiadementednesslunacyinstabilityunsoundness of mindloss of reasondeliriumhysteriamaniapsychosisinformal:crazinessarchaic:crazednessrare:delirationOpposite sanity
   • ▪ extreme foolishness or irrationality: "it might be pure insanity to take this loan" Similar follyfoolishnessfoolhardinessidiocystupidityimbecilityasininitylunacymadnesssillinesssenselessnessbrainlessnessthoughtlessnessirrationalityillogicalityabsurdityludicrousnessridiculousnessinformal:crazinessdaftnessOpposite sense

   Word Origin late 16th century: from Latin insanitas, from insanus (see insane).

   Scrabble Points: 11

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2. www.oed.com › dictionary › insanity_ninsanity, n. meanings, etymology and more | Oxford English ...

   www.oed.com › dictionary › insanity_n

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   The condition of being insane; a state of mind that impedes the ability to think, reason, or behave in ways that are considered normal, esp. one caused by mental illness. Also in extended use.

3. www.oxfordlearnersdictionaries.com › definition › englishinsanity noun - Definition, pictures, pronunciation and usage ...

   www.oxfordlearnersdictionaries.com › definition › english

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   noun. /ɪnˈsænəti/ [uncountable] (formal, law or old-fashioned, often offensive) the state of being insane synonym madness. He was found not guilty, by reason of insanity. The legal definition of insanity varies from one jurisdiction to another.

4. en.m.wikipedia.org › wiki › InsanityInsanity - Wikipedia

   en.m.wikipedia.org › wiki › Insanity

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   Insanity, madness, lunacy, and craziness are behaviors caused by certain abnormal mental or behavioral patterns. Insanity can manifest as violations of societal norms, including a person or persons becoming a danger to themselves or to other people.

5. dictionary.cambridge.org › us › dictionaryINSANITY | definition in the Cambridge English Dictionary

   dictionary.cambridge.org › us › dictionary

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   INSANITY meaning: 1. the condition of being seriously mentally ill: 2. an action that is stupid and likely to have…. Learn more.

6. www.vocabulary.com › dictionary › insanityInsanity - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › insanity

   Insanity is an ongoing state of extreme mental illness, which may cause abnormal or antisocial behaviors. If you bark at cats and meow at dogs, you might suffer from insanity.

7. www.collinsdictionary.com › dictionary › englishINSANITY definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › dictionary › english

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   3 days ago · insanity. (ɪnsænɪti ) 1. uncountable noun. Insanity is the state of being insane. The defence pleaded insanity, but the defendant was found guilty and sentenced. 2. uncountable noun. If you describe a decision or an action as insanity, you think it is very foolish . [disapproval]

8. www.collinsdictionary.com › us › dictionaryINSANITY definition in American English | Collins English ...

   www.collinsdictionary.com › us › dictionary

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   1 day ago · (ɪnsænɪti ) 1. uncountable noun. Insanity is the state of being insane. ...a psychiatrist who specialized in diagnosing insanity. 2. uncountable noun. If you describe a decision or an action as insanity, you think it is very foolish. [disapproval] ...the final financial insanity of the 1980s.