in·​sane | \ (ˌ)in-ˈsān How to pronounce insane (audio) \

Definition of insane

1a(1) : exhibiting a severely disordered state of mind
(2) law : affected with insanity (see insanity sense 2) criminally insane
b : unable to think in a clear or sensible way : crazy insane with jealousy not used technically
2 : used by, typical of, or intended for people having a severely disordered state of mind an insane asylum
3 : absurd an insane scheme for making money
4 informal : outrageously high or extreme making insane amounts of money The monster truck pursued him at insane speeds …— Hunter S. Thompson More than 22,000 athletes descend on Philadelphia's Franklin Field to chug insane amounts of Gatorade …— Chris Ballard also : exceptionally good or impressive Minnesota … has blazed out to an insane start, taking an early lead in the Northwest Division. — Tom Wheatley With his rough-edged baritone and ear for insane hooks, [reggae singer] Baby Cham always sounds wicked. — Rob Kenner

Other Words from insane

insaneness \ (ˌ)in-​ˈsān-​nəs How to pronounce insane (audio) \ noun

Synonyms & Antonyms for insane



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Examples of insane in a Sentence

The murderer was found to be criminally insane. She was insane with jealousy. He had an insane look in his eyes. She likes to drive at insane speeds. He had this insane idea that he could get rich by selling old computers.
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Recent Examples on the Web No matter where we are located, however, the one constant is that the travel opportunities are insane. Loren Braunohler, CNN, 10 Nov. 2021 Oh, and Angelo Auriana’s handkerchief egg pasta with pesto at Factory Kitchen—that dish is insane. David Hochman, Forbes, 29 Oct. 2021 Even since then, the number of Black country singers who are getting a shot in Nashville is insane. Jonathan Bernstein, Rolling Stone, 25 Oct. 2021 Allowing billion-dollar disasters to batter our coastlines, burn our forests and family homes, and flood our farms and communities at an ever-increasing rate but continuing to do nothing about it is indeed insane. Jessica Moerman, CNN, 24 Oct. 2021 Yvonne's career is insane right now, with specials and hosting and movies. Chancellor Agard,, 21 Oct. 2021 The Brilliance Resilience Moisturizer is also insane. Katie Intner, Harper's BAZAAR, 12 Oct. 2021 Yes, the tight-roping grab Mims made on a 52-yard touchdown pass midway through the fourth quarter was insane. Mike Finger, San Antonio Express-News, 9 Oct. 2021 As Einstein points out, doing the same things over and over and expecting the leaks to stop is insane. Omar Kelly,, 7 Oct. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'insane.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of insane

1575, in the meaning defined at sense 1a(1)

History and Etymology for insane

Latin insanus, from in- + sanus sane

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Dictionary Entries Near insane

ins and outs


insane asylum

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Statistics for insane

Last Updated

19 Nov 2021

Cite this Entry

“Insane.” Dictionary, Merriam-Webster, Accessed 26 Nov. 2021.

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More Definitions for insane



English Language Learners Definition of insane

: having or showing severe mental illness
: unable to think in a clear or sensible way
used in the phrase drive/make (someone) insane to describe annoying or bothering someone very much.


in·​sane | \ in-ˈsān How to pronounce insane (audio) \

Kids Definition of insane

1 : not normal or healthy in mind
2 : used by or for people who are insane an insane asylum
3 : very foolish or unreasonable

Other Words from insane

insanely adverb


in·​sane | \ (ˈ)in-ˈsān How to pronounce insane (audio) \

Medical Definition of insane

1 dated : exhibiting a severely disordered state of mind
2 law : affected with insanity (see insanity sense 2)

Other Words from insane

insanely adverb



Legal Definition of insane

: affected with insanity

More from Merriam-Webster on insane

Nglish: Translation of insane for Spanish Speakers

Britannica English: Translation of insane for Arabic Speakers


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