insanity








noun, plural in·san·i·ties.

  1. the condition of being insane; a derangement of the mind.
  2. Law. such unsoundness of mind as frees one from legal responsibility, as for committing a crime, or as signals one’s lack of legal capacity, as for entering into a contractual agreement.
  3. Psychiatry. (formerly) psychosis.
    1. extreme foolishness; folly; senselessness; foolhardiness: Trying to drive through that traffic would be pure insanity.
    2. a foolish or senseless action, policy, statement, etc.: We’ve heard decades of insanities in our political discourse.

noun plural -ties

  1. relatively permanent disorder of the mind; state or condition of being insane
  2. law a defect of reason as a result of mental illness, such that a defendant does not know what he or she is doing or that it is wrong
  3. utter folly; stupidity
n.

1580s, “state of being insane,” from Latin insanitatem (nominative insanitas) “unhealthfulness,” noun of quality from insanus (see insane). Meaning “extreme folly” is from 1844.

n.

  1. Persistent mental disorder or derangement. Not in scientific use.
  2. Unsoundness of mind sufficient in the judgment of a civil court to render a person unfit to maintain a contractual or other legal relationship or to warrant commitment to a mental health facility.
  3. In most criminal jurisdictions, a degree of mental malfunctioning considered to be sufficient to relieve the accused of legal responsibility for the act committed.

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