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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.

Shipping costs are up, too, Ferreri said, describing "insane" prices for the delivery of essential farm equipment.

From Barron's • Apr. 11, 2026

He said that people have offered him insane amounts of money for Coachella.

From Los Angeles Times • Apr. 10, 2026

"It was insane; I felt like I was really famous for one day and met so many amazing people," said Olivia.

From BBC • Mar. 16, 2026

Tracy has had an insane career but also an insane life, like the accident and coming back from that.

From The Wall Street Journal • Mar. 2, 2026

What am I supposed to say to this insane kid who thinks he’s from space?

From "Boy21" by Matthew Quick

Vocabulary lists containing insane

salu, san (health)

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