in-sanity

insanity

[in-san-i-tee]
noun, plural insanities.
1.
the condition of being insane; a derangement of the mind. dementia, lunacy, madness, craziness, mania, aberration.
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.
4.
a.
extreme foolishness; folly; senselessness; foolhardiness: Trying to drive through that traffic would be pure insanity.
b.
a foolish or senseless action, policy, statement, etc.: We've heard decades of insanities in our political discourse.

Origin:
1580–90; < Latin insānitās. See in-3, sanity

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insanity (ɪnˈsænɪtɪ)
 
n , pl -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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

insanity
1580s, from L. insanitatem "unhealthfulness," noun of quality from insanus (see insane).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

insanity in·san·i·ty (ĭn-sān'ĭ-tē)
n.

  1. Persistent mental disorder or derangement.

  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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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