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[in-seyn] /ɪnˈseɪn/
not sane; not of sound mind; mentally deranged.
of, relating to, or characteristic of a person who is mentally deranged:
insane actions; an insane asylum.
utterly senseless:
an insane plan.
Origin of insane
1550-60; < Latin insānus. See in-3, sane
Related forms
insanely, adverb
insaneness, noun
pseudoinsane, adjective
1. demented; lunatic, crazed, crazy; maniacal. 3. foolish, irrational. See mad. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for insanest
Historical Examples
  • But if this confessed the truth, she was the insanest of women.

  • Behold now the consequence of the wilful Welshwoman's insanest of legacies!

  • Thus he was perfectly rational, though when others beheld him he appeared the insanest of mortals.

  • No cloak of insanest belief, of dullest mistake, would henceforth hide any more the dreary nakedness of the skeleton, life!

    There and Back George MacDonald
  • Nothing but the insanest bigotry in favor of their own conjectures could lead them to quarrel with us for expounding ours.

    Comic Bible Sketches George W. Foote
  • But the first love—the only love worth having; and yet, of all loves the most ignorant—the insanest.

    The Tenants of Malory Joseph Sheridan Le Fanu
British Dictionary definitions for insanest


  1. mentally deranged; crazy; of unsound mind
  2. (as collective noun; preceded by the): the insane
characteristic of a person of unsound mind: an insane stare
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 insanest



1550s, from Latin insanus "mad, insane; outrageous, excessive, extravagant," from in- "not" (see in- (1)) + sanus "well, healthy, sane" (see sane). Originally only of persons; of actions, from 1842. Cf. lunatic; and Italian pazzo "insane," originally a euphemism, from Latin patiens "suffering." German verrückt, literally past participle of verrücken "to displace," "applied to the brain as to a clock that is 'out of order' " [Buck]. The noun meaning "insane person" is attested from 1786.

Online Etymology Dictionary, © 2010 Douglas Harper
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insanest in Medicine

insane in·sane (ĭn-sān')
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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