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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.

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

From Slate • Apr. 23, 2026

But we got flights really late, and then hotels are insane in Palm Springs and in Indio.

From Los Angeles Times • Apr. 22, 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

“There is this insane new piece of technology that is fundamentally going to rewire how we work. Some companies are going to make it, some companies are not,” Huang said.

From The Wall Street Journal • Apr. 14, 2026

I was going to shriek like an insane woman who has been locked in an attic for a great many years.

From "Okay for Now" by Gary D. Schmidt

Vocabulary lists containing insane

salu, san (health)

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