insanity

[in-san-i-tee] / ɪnˈsæn ɪ ti /

NOUN

mental illness; foolishness

Synonyms

STRONGEST

absurdity alienation craziness folly frenzy hysteria irresponsibility lunacy madness mental disorder

STRONG

aberration delirium delusion derangement distraction hallucination irrationality mania neurosis phobia psychopathy psychosis senselessness unbalance

WEAK

preposterousness unreasonableness witlessness

Antonyms

STRONG

balance certainty fact reality truth

WEAK

sanity soundness wellness

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.

This allows events to balloon beyond our comprehension, and may be preventing us from stopping this insanity.

From Salon • Mar. 25, 2026

Only a jury can return a verdict of "not guilty by reason of insanity".

From BBC • Mar. 20, 2026

Others have been declared not guilt by reason of insanity, while others are in conservatorship.

From Los Angeles Times • Mar. 6, 2026

That flying blob of insanity isn’t for everyone.

From The Wall Street Journal • Feb. 16, 2026

Someone once told him the definition of insanity is doing the same thing over and over, expecting a different result.

From "Eleven" by Tom Rogers