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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 insanely
Contemporary Examples
Historical Examples
  • Old Minos is insanely in love with Ismene, who is so beautiful and virtuous.

    Walter Pieterse Multatuli
  • I was madly, insanely jealous, and I forbade my wife to meet him.

    The New Tenant E. Phillips Oppenheim
  • I know myself too well, I am jealous of everything of the past—oh, insanely jealous.

    Murder in Any Degree Owen Johnson
  • No one knew whether we'd quarreled or not, or how insanely jealous I could be.

    The Man the Martians Made Frank Belknap Long
  • They regarded them as a sect of extremely absurd Jews, insanely obstinate, and wholly contemptible.

British Dictionary definitions for insanely


  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 insanely



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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insanely 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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