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insane

[in-seyn] /ɪnˈseɪn/
adjective
1.
not sane; not of sound mind; mentally deranged.
2.
of, pertaining to, or characteristic of a person who is mentally deranged:
insane actions; an insane asylum.
3.
utterly senseless:
an insane plan.
Origin
1550-1560
1550-60; < Latin insānus. See in-3, sane
Related forms
insanely, adverb
insaneness, noun
pseudoinsane, adjective
Synonyms
1. demented; lunatic, crazed, crazy; maniacal. 3. foolish, irrational. See mad.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for insane
  • For them, going to extremes that may seem insane was actually a logical progression.
  • insane with fury, he murdered his family-then turned his sword upon himself.
  • Take a looks at relative salaries, though, and it isn't as insane as it appears.
  • The good doctor is also completely insane if he actually thinks that all these students gave up their cell phones.
  • My vow must have seemed to you extremely cruel, or insane.
  • The prosecution had mustered three psychiatrists to say that he wasn't insane.
  • They further found that he was no longer insane and he was released.
  • But he also has a number of beliefs that are, not to put too fine a point on it, utterly insane.
  • The apartments wander through the complexity of the building's form, so their floor plans look insane.
  • It's a perfect example of the kind of word that, if repeated often enough, will make you insane.
British Dictionary definitions for insane

insane

/ɪnˈseɪn/
adjective
1.
  1. mentally deranged; crazy; of unsound mind
  2. (as collective noun; preceded by the) the insane
2.
characteristic of a person of unsound mind an insane stare
3.
irresponsible; very foolish; stupid
Derived Forms
insanely, adverb
insaneness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for insane
insane
1560, from L. insanus "mad, insane, outrageous, excessive, extravagant," from in- "not" + sanus (see sane). Originally only of persons; of actions, from 1842. Cf. lunatic; and It. pazzo "insane," originally a euphemism, from L. patiens "suffering." Ger. verrückt, lit. pp. of verrücken "to displace," "applied to the brain as to a clock that is 'out of order' " [Buck].
Online Etymology Dictionary, © 2010 Douglas Harper
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insane in Medicine

insane in·sane (ĭn-sān')
adj.
Of, exhibiting, or afflicted with insanity.

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