insane

adjective
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

Synonyms

balmy, barmy [chiefly British], bats, batty, bedlam, bonkers, brainsick, bughouse [slang], certifiable, crackbrained, cracked, crackers, crackpot, cranky [dialect], crazed, crazy, cuckoo, daffy, daft, demented, deranged, fruity [slang], gaga, haywire, kooky (also kookie), loco [slang], loony (also looney), loony tunes (or looney tunes), lunatic, mad, maniacal (also maniac), mental, meshuga (or meshugge), moonstruck, non compos mentis, nuts, nutty, psycho, psychotic, scatty [chiefly British], screwy, unbalanced, unhinged, unsound, wacko (also whacko), wacky (also whacky), wud [chiefly Scottish]

Antonyms

balanced, compos mentis, sane, sound, uncrazy

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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

And that will happen without the massive, social engineering and insane corporate welfare being thrown at the industry. Jon Caldara, The Denver Post, "Caldara: In Colorado you’re still paying for rich folks to buy a luxury second car," 7 June 2019 But suggesting that this is in any way comparable to catcalling is patently ridiculous and insane. Jane Coaston, Vox, "Why conservatives love to hate Alexandria Ocasio-Cortez," 20 Aug. 2018 Here's why: This special counsel probe makes Trump insane. Chris Cillizza, CNN, "Why deep down Donald Trump really wants to sit down with Robert Mueller," 4 Apr. 2018 An 80-year-old man did it for him, which is insane. Joanna Saltz, House Beautiful, "Designers Spill Their Secrets to Creating Rooms That Blow You Away," 20 May 2019 The beige stitching isn't what catches your eye, though—the insane gold trim on the center console, dashboard, and door panels is. Daniel Golson, Car and Driver, "The 2020 BMW M5 Edition 35 Years Has Insane Gold Interior Trim," 16 May 2019 In spacecraft these small flaws can become fatal, so the engineers have to simulate these insane pressure loads and temperature swings. Joe Pappalardo, Popular Mechanics, "NASA's Mars 2020 Mission Passes Critical Heat Shield Test," 2 May 2019 Everyone's flare jeans and Kelly's insane (platform? Katherine J. Igoe, Marie Claire, "Jenna Dewan Posts Hilarious Throwback Pic of Her as a Background Dancer for Kelly Clarkson," 3 May 2019 Then-deputy district attorney Marcia Clark, who later became a household name during the O.J. Simpson trial, argued that Bardo was obsessed, not insane. Blake Bakkila, Good Housekeeping, "How Rebecca Schaeffer's Horrific Murder Led to the Nation's First Anti-Stalking Law," 12 Apr. 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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Statistics for insane

Last Updated

10 Jun 2019

Look-up Popularity

Time Traveler for insane

The first known use of insane was in 1575

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More Definitions for insane

insane

adjective

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.

insane

adjective
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

insane

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

Medical Definition of insane

dated
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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insane

adjective
in·​sane

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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