INSANE Synonyms: 297 Similar and Opposite Words

insane

adjective

(ˌ)in-ˈsān

Definition of insane

as in mad

unable to think in a clear or sensible way After learning of the robbery, they were insane with anger and foolishly searched the neighborhood looking for their belongings.

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Antonyms & Near Antonyms

as in absurd

conceived or made without regard for reason or reality a completely insane plan to build an opera house in the middle of nowhere

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as in stupid

showing or marked by a lack of good sense or judgment an insane plan to blow all of their savings on lottery tickets

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Antonyms & Near Antonyms

as in excessive

going beyond a normal or acceptable limit in degree or amount wanted an insane amount of money to paint our house

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of insane These were two insane asks — a 7-foot giant and an 8-year-old kid who has to be your second lead. — James Hibberd, HollywoodReporter, 23 July 2026 Not everyone went slowly insane under such circumstances, as Bartleby does in Melville’s story, but the experience was disorienting all the same. — Jake Lundberg, The Atlantic, 23 July 2026 To see that journey completely through to the end has been insane. — Bethy Squires, Vulture, 22 July 2026 The stupidity and greed of the status quo threatens to drive her insane. — Literary Hub, 21 July 2026 See All Example Sentences for insane

Recent Examples of Synonyms for insane

Adjective

There was also a stream of characters who visited the island, from a pop group to a movie producer, a mad scientist, and Russian cosmonauts.

— Encyclopedia Britannica, Encyclopedia Britannica, 5 Aug. 2026
There are a few pages spent on Deflategate (that made Brady mad), only a few paragraphs devoted to Aaron Hernandez, none on Spygate.

— Darren Cooper, Forbes.com, 4 Aug. 2026

Definition of mad

Adjective

The case that American leadership in this technology carries a genuine security dimension has never looked stupid to me.

— Jason Snyder, Forbes.com, 8 Aug. 2026
The women are in stupid costumes (Heather Gay is dressed as a leprechaun at one point) and yelling at one another for yet-unknown reasons.

— Jason P. Frank, Vulture, 6 Aug. 2026

Definition of stupid

Adjective

There is a marginal risk of excessive rainfall across all of east Central Florida, according to NWS Melbourne.

— Garfield Hylton, The Orlando Sentinel, 3 Aug. 2026
Importantly, the robot maintained stable locomotion throughout testing, showing that the AI controller could effectively harness passive energy stored in the compliant feet without introducing instability or excessive corrective movements.

— Jijo Malayil, Interesting Engineering, 3 Aug. 2026

Definition of excessive

Adjective

Especially after a clunker of a season in 2025, superstar receiver Justin Jefferson won’t settle for anything other than maniacal attention to detail on and off the field.

— Alec Lewis, New York Times, 28 July 2026
The odd thing about this choice is that, although the DSA’s platform is indeed chock-full of maniacal proposals, on this particular idea, the maniacs have a point.

— Jonathan Chait, The Atlantic, 22 July 2026

Definition of maniacal

Adjective

Years earlier at her former lab in Ohio, chromosomes in mouse eggs and embryos began dividing in bizarre ways, creating the kinds of genetic errors that can lead to Down syndrome and other chromosomal disorders.

— Sandee LaMotte, CNN Money, 7 Aug. 2026
Her videos were outrageous and conspiratorial, and the more elaborate and bizarre her stories became, the more people online were drawn to her.

— Zander Sherman, Rolling Stone, 7 Aug. 2026

Definition of bizarre

Adjective

Two of the craziest comebacks of the season came this week, courtesy of teams trying to stay in the American League wild card race.

— ABC News, ABC News, 3 Aug. 2026
The last movie had crazy stuff going on with the multiverse, multiple Spider-Men, and rips in the space-time continuum.

— Chris Lee, Vulture, 3 Aug. 2026

Definition of crazy

Adjective

To an outsider, and in isolation, some of these habits may not seem so extreme—Reddit peptides excepted.

— Tori Latham, Robb Report, 8 Aug. 2026
North of the border, in British Columbia, hundreds more homes were lost this week, and 15,000 people are currently under evacuation, with extreme fire weather conditions predicted to worsen in the coming days.

— John Vaillant, Time, 8 Aug. 2026

Definition of extreme

Browse Nearby Words

ins and outs

insane

insanely

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Style

“Insane.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/insane. Accessed 10 Aug. 2026.

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Synonyms of insane

adjective

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