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   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.merriam-webster.com › dictionary › insanityInsanity Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › insanity

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   The meaning of INSANITY is a severely disordered state of the mind usually occurring as a specific disorder. How to use insanity in a sentence. On the Meaning of Insanity

3. en.wikipedia.org › wiki › InsanityInsanity - Wikipedia

   en.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.

4. www.dictionary.com › browse › insanityINSANITY Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › insanity

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   Insanity definition: (not in technical use as a medical diagnosis) the condition of being insane; a derangement of the mind.. See examples of INSANITY used in a sentence.

5. dictionary.cambridge.org › dictionary › englishINSANITY | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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

6. 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.

7. www.oxfordlearnersdictionaries.com › definitioninsanity noun - Definition, pictures, pronunciation and usage ...

   www.oxfordlearnersdictionaries.com › definition

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   [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.

8. 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. The noun insanity originates from the Latin word insanitatem, meaning "unhealthfulness" relating to the mind.