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1. Dictionary

   Lu·na·cy

   /ˈlo͞onəsē/

   

   noun

   • 1. the state of being a lunatic; insanity (not in technical use): "it has been suggested that originality demands a degree of lunacy" Similar insanitymadnessmental illnessderangementdementiadementednessinsanenessloss of reasonunsoundness of mindmental instabilitymaniafrenzypsychosisinformal:crazinessOpposite sanity
   • ▪ extreme folly or eccentricity: "such an economic policy would be sheer lunacy" Similar follyfoolishnessfoolhardinessstupidityidiocyimbecilityirrationalityillogicalitysenselessnessnonsenseabsurdityabsurdnessmadnessinsanitysillinessinanityridiculousnessludicrousnessinformal:crazinessdaftnessOpposite senseprudence

   Word Origin mid 16th century (originally referring to insanity of an intermittent kind attributed to changes of the moon): from lunatic + -acy.

   Scrabble Points: 11

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2. People also ask

   What does Lunacy mean?

   • If you describe someone's behaviour as lunacy, you mean that it seems very strange or foolish. It remains lunacy to produce yet more coal to add to power stations' stockpiles. Lunacy is severe mental illness. Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers 1. 2. Collins English Dictionary.

   LUNACY definition and meaning | Collins English Dictionary

   www.collinsdictionary.com/dictionary/english/lunacy

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   Where did the word 'Lunacy' come from?

   • Indeed, that rather antiquated word 'lunacy' comes from Luna, who was the Roman Goddess of the Moon. One definition of lunacy is "intermittent insanity once believed to be related to phases of the moon". This belief goes back a long way.

   Can a full Moon affect behaviour? › Dr Karl's Great Moments In Science

   www.abc.net.au/science/articles/2012/03/27/3464601.htm

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   Was the 1980s a total Lunacy?

   • The 1980s completely took off for us, and it was total lunacy. This is an act of sheer lunacy when only one of the cast, admittedly its leading female character, is a native speaker. But a minority have been infected by health and safety lunacy, by fear of an out-of-control compensation culture and by an upbringing that discourages initiative.

   LUNACY definition and meaning | Collins English Dictionary

   www.collinsdictionary.com/dictionary/english/lunacy

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3. www.dictionary.com › browse › lunacyLUNACY Definition & Meaning | Dictionary.com

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   extreme foolishness or an instance of it: Her decision to resign was sheer lunacy. Synonyms: stupidity, folly. unsoundness of mind sufficient to incapacitate one for civil transactions: a former legal term. lunacy. / ˈluːnəsɪ / noun. (formerly) any severe mental illness. foolishness or a foolish act. Discover More. Word History and Origins.

4. www.collinsdictionary.com › dictionary › englishLUNACY definition and meaning | Collins English Dictionary

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   19 hours ago · 1. a. Obsolete. intermittent insanity, formerly supposed to change in intensity with the phases of the moon. b. mental unsoundness; insanity. 2. Word forms: plural ˈlunacies. great folly or a foolish act.

5. dictionary.cambridge.org › learner-english › lunacyLUNACY | meaning - Cambridge Learner's Dictionary

   dictionary.cambridge.org › learner-english › lunacy

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   noun [ U ] uk / ˈluːnəsi / us. Add to word list. stupid behaviour that will have bad results: It was lunacy spending all that money. (Definition of lunacy from the Cambridge Learner's Dictionary © Cambridge University Press) Translations of lunacy. in Chinese (Traditional) 愚蠢的行為，不明智的舉動, 精神病，精神錯亂… See more. in Chinese (Simplified)

6. www.oxfordlearnersdictionaries.com › lunacylunacy noun - Definition, pictures, pronunciation and usage ...

   www.oxfordlearnersdictionaries.com › lunacy

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   Definition of lunacy noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

7. www.yourdictionary.com › lunacyLunacy Definition & Meaning | YourDictionary

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   Lunacy Definition. Mental unsoundness; insanity. Intermittent insanity, formerly supposed to change in intensity with the phases of the moon. Great or wild foolishness. A policy that proved to be a piece of economic lunacy. Great folly or a foolish act. Something deeply misguided.

8. dictionary.cambridge.org › learner-english › lunacylunacy | definition in the Cambridge Learner’s Dictionary

   dictionary.cambridge.org › learner-english › lunacy

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   Definition of lunacy – Learner’s Dictionary. lunacy. noun [ U ] uk/ˈluːnəsi/us. stupid behaviour that will have bad results: It was lunacy spending all that money. Want to learn more? Improve your vocabulary with English Vocabulary in Use from Cambridge. Learn the words you need to communicate with confidence.

9. www.collinsdictionary.com › english › lunacyLUNACY definition in American English | Collins English ...

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   May 13, 2024 · 1. a. Obsolete. intermittent insanity, formerly supposed to change in intensity with the phases of the moon. b. mental unsoundness; insanity. 2. Word forms: plural ˈlunacies. great folly or a foolish act.