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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.

A Reddit user who posted about it in the r/ChatGPT subreddit called it "genuinely insane".

From BBC • Apr. 30, 2026

That’s an insane opinion to have,’” he remembers reading.

From Los Angeles Times • Apr. 23, 2026

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

From Slate • Apr. 23, 2026

“It’s pretty insane to watch a room full of industry people rush the stage,” said Emily Cohen Belote, the global head of country programming at Amazon Music, who was in the crowd.

From The Wall Street Journal • Apr. 13, 2026

“How much we both hate what Mr. Lemoncello’s doing at his so-called library. Do you know what insane game they had us play today? Reading while eating.”

From "Mr. Lemoncello's Library Olympics" by Chris Grabenstein

Vocabulary lists containing insane

salu, san (health)

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