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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

"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

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

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

I look at her like she's actually insane.

From "Five Feet Apart" by Rachael Lippincott

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.