follow Dictionary.com

How do you spell Hannukah?

insane

[in-seyn] /ɪnˈseɪn/
adjective
1.
not sane; not of sound mind; mentally deranged.
2.
of, relating 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.
Cite This Source
Examples from the web 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
Cite This Source
Word Origin and History for insane
adj.

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
Cite This Source
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.
Cite This Source

Word of the Day

Difficulty index for insane

Most English speakers likely know this word

Word Value for insane

6
8
Scrabble Words With Friends

Quotes with insane

Nearby words for insane