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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.

Yet Mr. Cook would have been insane to do otherwise.

From The Wall Street Journal • May 8, 2026

“The network is insane because, at this point, everyone knows someone who is doing something,” Vital Lyfe COO Andrew Harner told MarketWatch.

From MarketWatch • May 7, 2026

Like, how is the culture enriched by fixating on the musings of visibly insane posters on 4Chan?

From Slate • May 7, 2026

The self-confessed rap fan even threw in some hip-hop lyrics, declaring Iran's leaders to be, in the words of Cypress Hill, "insane in the brain."

From Barron's • May 6, 2026

It is doubtful if any father ever was more insane about an offspring.

From "Cheaper by the Dozen" by Frank B. Gilbreth Jr. and Ernestine Gilbreth Carey

Vocabulary lists containing insane

salu, san (health)

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