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Definitions

insane

[in-seyn] / ɪnˈseɪn /
ADJECTIVE
mad
Synonyms
STRONGEST
crazy delirious demented deranged frantic frenzied kooky nutty
WEAK
aberrant bananas batty crazed cuckoo daft frenetic loony lunatic non compos mentis of unsound mind off one's rocker out of one's mind raving unbalanced unhinged unsound unstable
Antonyms
STRONGEST
balanced calm collected rational reasonable sane sensible wise
WEAK
OK sound unenthusiastic

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Bringing his bag of insane tricks and witty banter to the Wilshire Ebell Theatre for two nights on May 8 and 9, Willman’s crowd work, storytelling and intricate tricks are inspired by everyday life.

From Los Angeles Times • Apr. 29, 2026

Grieving is also time to get angry and justified in your own insane behavior.

From Slate • Apr. 23, 2026

She smacked her back on a rock and had "insane" pressure across her back that was spreading into her stomach.

From BBC • Apr. 18, 2026

“All of us are going through this insane geopolitical time,” Sullivan says.

From Barron's • Apr. 15, 2026

Actually there was no sure way to make it through a world that had gone completely insane.

From "The Boy on the Wooden Box" by Leon Leyson

Vocabulary lists containing insane

salu, san (health)

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