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

Definition of insane

1a(1) : exhibiting a severely disordered state of mind : affected with mental illness
(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 mentally ill people 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 … 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

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Other Words from insane

insanely adverb
insaneness \ (ˌ)in-​ˈsān-​nəs How to pronounce insaneness (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 Just trying to slow each other down because the pace was insane., "'He did the unthinkable': An oral history of Sam Dekker’s legendary state-title game for Sheboygan Lutheran," 19 Mar. 2020 The feeling in my head from the pressure was insane. Morgan Winsor, ABC News, "Tennessee tornadoes latest: 22 missing, 5 kids among the dead in hard-hit Putnam County," 4 Mar. 2020 Base versions of this insane off-roader start at the equivalent of $424,155. Connor Hoffman, Car and Driver, "Brabus's 800-HP Mercedes-AMG G-Wagen Has a Drone Landing Pad," 26 Feb. 2020 Wowwww these two eye looks are insane and so beautiful!! Kelsey Stiegman, Seventeen, "Jeffree Star and NikkieTutorisls Seem to Be Mending Their Friendship," 21 Feb. 2020 Uniqlo's quality is great but its cost per wear is also insane. Bianca Nieves, Teen Vogue, "Uniqlo's U Spring Summer 2020 Collection Is So Good, We Can't Wait to Wear It," 20 Feb. 2020 Speaking as an architecture critic, this is insane and borderline-totalitarian. Kate Wagner, The New Republic, "Duncing About Architecture," 8 Feb. 2020 After a meteorite crashes into farmland in the backwoods of Massachusetts, the land begins to transform in strange ways, and the small family who lives there goes insane. Adam Epstein, Quartz, "Why filmmakers are still drawn to H.P. Lovecraft, racism and all," 27 Jan. 2020 In the show’s premise, his character builds robot sidekicks to keep from going insane, and the television viewer sees the the cast in silhouette wisecracking in front of a projection screen. Rod Stafford Hagwood,, "November events, from comedy and food festivals to Colombia-Peru soccer and alligator wrestling," 31 Oct. 2019

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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Time Traveler for insane

Time Traveler

The first known use of insane was in 1575

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Statistics for insane

Last Updated

31 Mar 2020

Cite this Entry

“Insane.” Dictionary, Merriam-Webster, Accessed 8 Apr. 2020.

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How to pronounce insane (audio)

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 : exhibiting a severely disordered state of mind : affected with mental illness
2 : used by, typical of, or intended for mentally ill people an insane asylum

Other Words from insane

insanely adverb

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Legal Definition of insane

: affected with insanity

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More from Merriam-Webster on insane

Thesaurus: All synonyms and antonyms for insane

Spanish Central: Translation of insane

Nglish: Translation of insane for Spanish Speakers

Britannica English: Translation of insane for Arabic Speakers

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