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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.

But they were also about to prove that they were already better than most humans at making sense of a tournament known for being completely insane, as Ben Cohen and Andrew Beaton write.

From The Wall Street Journal • Mar. 28, 2026

Bryony Coles, from Belfast said it was "truly insane" to find out a photoshoot she had organised with Derry Girls actor Saoirse-Monica Jackson would feature in Vogue.

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 look at her like she's actually insane.

From "Five Feet Apart" by Rachael Lippincott