insane

[in-seyn]
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:
1550–60; < Latin insānus. See in-3, sane

insanely, adverb
insaneness, noun
pseudoinsane, adjective


1. demented; lunatic, crazed, crazy; maniacal. 3. foolish, irrational. See mad.
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World English Dictionary
insane (ɪnˈseɪn)
 
adj
1.  a.  mentally deranged; crazy; of unsound mind
 b.  (as collective noun; preceded by the): the insane
2.  characteristic of a person of unsound mind: an insane stare
3.  irresponsible; very foolish; stupid
 
in'sanely
 
adv
 
in'saneness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

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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American Heritage
Medical Dictionary

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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Example sentences
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.
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