Insanity definition

ĭn-sănĭ-tē
Frequency:
(law) 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.
noun
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2
Severe mental illness or derangement. Not used in psychiatric diagnosis.
noun
8
2
Extreme foolishness or irrationality.
noun
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2
Something that is extremely foolish, distinctly irrational, or wildly excited.
noun
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2
The state of being insane; mental illness or derangement.
noun
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Unsoundness of mind sufficient to render a person unfit to maintain a contractual or other legal relationship or sufficient to warrant commitment to a mental health facility.
noun
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Incapacity to form the criminal intent necessary for legal responsibility, as when a mental disorder prevents a person from knowing the difference between right and wrong.
noun
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A mental disorder that deprives a criminal defendant of capacity to be tried.
noun
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Great folly; extreme senselessness.
noun
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3
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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Incapacity because of a mental disorder to participate adequately as a defendant in criminal proceedings or to understand the imposition of a criminal punishment, particularly the death penalty.
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Other Word Forms

Noun

Singular:
insanity
Plural:
insanities

Origin of insanity

  • "insane+-ity": insānus (“unhealthy; insane”) + -itās

    From Wiktionary

  • "in- + sanity": in-- (“healthy; sane”) +‎ sanitās.

    From Wiktionary