Thesaurus.com
Dictionary.com
Showing results for insane.
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.

I remember when he told me about the membership, I was like, “You pay how much? That’s insane, dude.”

From Los Angeles Times • Apr. 17, 2026

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

From Barron's • Apr. 11, 2026

Those stories are so real and it is insane.

From The Wall Street Journal • Apr. 3, 2026

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

From Salon • Mar. 21, 2026

But when young Mister Scales stepped on the gas, the roar became high pitched, deafening, and insane.

From "Cheaper by the Dozen" by Frank B. Gilbreth Jr. and Ernestine Gilbreth Carey

Vocabulary lists containing insane

salu, san (health)

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!