Insanity meaning

ĭn-săn'ĭ-tē
The definition of insanity is having a serious mental illness or being extremely foolish.

An example of insanity is a personality disorder.

An example of insanity is jumping out of an airplane without a parachute.

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The state of being insane; madness.
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Any form or degree of mental derangement or unsoundness of mind, permanent or temporary, that makes a person incapable of what is regarded legally as normal, rational conduct or judgment.
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Severe mental illness or derangement. Not used in psychiatric diagnosis.
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The state of being insane; mental illness or derangement.
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Great folly; extreme senselessness.
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A mental disorder that deprives a criminal defendant of capacity to be tried.
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Origin of insanity

  • "insane+-ity": insānus (“unhealthy; insane”) + -itās
    From Wiktionary
  • "in- + sanity": in-- (“healthy; sane”) +‎ sanitās.
    From Wiktionary