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Definition of insanity noun from the Oxford Advanced Learner's Dictionary

insanity

noun
 
/ɪnˈsænəti/
 
/ɪnˈsænəti/
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  1. [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.
    The use of insanity with this meaning can be offensive, although it still has a technical use in law. see also diminished responsibility opposite sanity
    Extra Examples
    • Hamlet feigns insanity to disguise his bloody motive.
    • His lawyer got him off on an insanity plea.
    • The insanity defence is one of the most controversial in law.
    Oxford Collocations Dictionaryadjective
    • total
    • temporary
    verb + insanity
    • plead
    • feign
    • stop
    insanity + noun
    • defence/​defense
    • plea
    phrases
    • by reason of insanity
    See full entry
  2. [uncountable]
    (also insanities [plural])
    actions that are very stupid and possibly dangerous synonym madness, lunacy
    • It would be sheer insanity to attempt the trip in such bad weather.
    • Congress must put a stop to this insanity.
    • But the show does capture the various insanities and absurdities of his life.
    Topics Dangerc2
  3. Word Originlate 16th cent.: from Latin insanitas, from insanus, from in- ‘not’ + sanus ‘healthy’.
See insanity in the Oxford Advanced American Dictionary
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noun
 
 
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