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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.

Those stories are so real and it is insane.

From The Wall Street Journal • Apr. 3, 2026

"It was my dream to work with Vogue and have my 'Devil Wears Prada' moment so to be able to now say that I am a Vogue-published photographer, truly is insane."

From BBC • Mar. 26, 2026

What about a melty, fluffy egg that has an insane cheese pull?

From Salon • Mar. 21, 2026

And the core of that story, a man falsely imprisoned for a crime he didn’t commit and eventually driving him insane, is unfortunately pretty evergreen.

From Los Angeles Times • Mar. 19, 2026

I bet that everyone there really did think that there was an insane woman who had been locked in the attic of the theater for a great many years and they had just heard her.

From "Okay for Now" by Gary D. Schmidt