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1. Dictionary

   Lu·na·tic

   /ˈlo͞onəˌtik/

   

   noun

   • 1. a mentally ill person (not in technical use). Similar maniacmadmanmadwomanpsychopathpsychoticinformal:loonyloonnutnutcasenutjobcuckoohead caseheadbangerscrewballpsychonutterradgewing nuthave a screw loosehave bats in the/one's belfry
   • ▪ an extremely foolish or eccentric person: "this lunatic just accelerated out of the side of the road" Similar foolidiotimbecilemoron

   adjective

   • 1. mentally ill (not in technical use): "a ward of lunatic old ladies" Similar madinsanementally illcertifiablederangeddementedof unsound mindout of one's mindnot in one's right mindsick in the headnot togethercrazycrazednon compos mentisunbalancedunhingedunstabledisturbeddistractedstark madmanicfrenziedravingdistraughtfrantichystericaldeliriouspsychoticpsychopathicmad as a hattermad as a March harefoaming at the mouthsectionableinformal:mentaloff one's headout of one's headoff one's nutnutsnuttynutty as a fruitcakeoff one's rockernot (quite) right in the headaround the bendstark raving madraving madbatsbonkerscuckoocrackedloopyloonybananaslocodippyscrewyschizoidtouchedgagaoff the wallnot all therenot right upstairsbarmycrackersbarkingbarking madstark staring maddottybattyround the twistoff one's trolleyas daft as a brushnot the full shillingup the poleaway with the fairiesbuggynutsynutsoout of one's treemeshugasquirrellywackoinformal:bushedyarraporangihave kangaroos in the/one's top paddockOpposite sane
   • ▪ extremely foolish, eccentric, or absurd: "he would be asked to acquiesce in some lunatic scheme" Similar foolishstupidsillyidiotichalfwittedwitlessbrainlessmindlessthoughtlessimprudentincautiousirresponsibleinjudiciousindiscreetunwiseunintelligentunreasonableill-advisedill-consideredimpoliticrashrecklessfoolhardylunaticabsurdsenselesspointlessnonsensicalinanefatuousridiculouslaughablerisiblederisibleinformal:dumbdimdimwitteddopeydamfoolhalf-bakedharebrainedcrackbrainedpeabrainedwooden-headedthickheadednuttymadcrazydippycuckooscrewywackybarmydaftbattydottygormlessglaikitdumb-asschowderheadeddotishOpposite sensiblewise

   Word Origin Middle English: from Old French lunatique, from late Latin lunaticus, from Latin luna ‘moon’ (from the belief that changes of the moon caused intermittent insanity).

   Scrabble Points: 9

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2. www.merriam-webster.com › dictionary › lunaticLunatic Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › lunatic

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   The meaning of LUNATIC is someone affected with a severely disordered state of mind. How to use lunatic in a sentence.

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

   www.dictionary.com › browse › lunatic

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   a person whose actions and manner are marked by extreme eccentricity or recklessness. a person legally declared to be of unsound mind and who therefore is not held capable or responsible before the law: a former legal term. adjective. (no longer in technical use; now considered offensive) insane.

4. dictionary.cambridge.org › dictionary › englishLUNATIC | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   LUNATIC definition: 1. someone who behaves in a silly or dangerous way: 2. a word for a person who has a mental…. Learn more.

5. www.vocabulary.com › dictionary › lunaticLunatic - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › lunatic

   A lunatic is someone who is either clinically insane or just acting really crazy. Someone driving too fast and zigging in and out of traffic is driving like a lunatic.

6. dictionary.cambridge.org › us › dictionaryLUNATIC | definition in the Cambridge English Dictionary

   dictionary.cambridge.org › us › dictionary

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   LUNATIC meaning: 1. someone who behaves in a silly or dangerous way: 2. a word for a person who has a mental…. Learn more.

7. www.collinsdictionary.com › us › dictionaryLUNATIC - All you need to know about it | Collins English ...

   www.collinsdictionary.com › us › dictionary

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   If you describe someone's behavior or ideas as lunatic, you think they are very foolish and possibly dangerous.

8. www.thefreedictionary.com › lunaticLunatic - definition of lunatic by The Free Dictionary

   www.thefreedictionary.com › lunatic

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   1. an insane person. 2. a person whose actions and manner are marked by extreme eccentricity or recklessness. 3. Law. a person legally declared to be of unsound mind. adj. 4. insane; demented; crazy. 5. wildly or recklessly foolish. 6. designated for or used by the insane: a lunatic asylum.

9. www.oxfordlearnersdictionaries.com › definition › englishlunatic noun - Definition, pictures, pronunciation and usage...

   www.oxfordlearnersdictionaries.com › definition › english

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

10. www.collinsdictionary.com › dictionary › englishLUNATIC definition and meaning | Collins English Dictionary

    www.collinsdictionary.com › dictionary › english

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    5 days ago · If you describe someone as a lunatic, you think they behave in a dangerous, stupid, or annoying way. [ informal , disapproval ] Her son thinks she's an absolute raving lunatic.

11. www.dictionary.com › browse › lunatic'sLunatic Definition & Meaning | Dictionary.com

    www.dictionary.com › browse › lunatic's

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    designated for or used by the insane: a lunatic asylum. gaily or lightheartedly mad, frivolous, eccentric, etc.: She has a lunatic charm that is quite engaging.