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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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British Dictionary definitions for in-sanest

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
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Word Origin and History for in-sanest
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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in-sanest 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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