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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.

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

From Salon • Mar. 21, 2026

Another added: "It would be insane to challenge the patient."

From BBC • Mar. 11, 2026

When the Islamic revolution happened in 1979, they said, This is an insane system, a monarchy, that the son of the current guy is the person who’s going to rule until he dies.

From Slate • Mar. 11, 2026

“That’d be insane to me,” says coach Travis Steele.

From The Wall Street Journal • Mar. 2, 2026

Their logic was simple: only someone insane would try to steal the Mona Lisa, so the Mona Lisa must have been stolen by someone who was, well, insane.

From "The Mona Lisa Vanishes" by Nicholas Day