The meaning of INSANE is exhibiting a severely disordered state of mind. How to use insane in a sentence.

INSANE definition: (not in technical use as a medical diagnosis) not sane; not of sound mind; mentally deranged. See examples of insane used in a sentence.

INSANE definition: 1. very annoyed, angry, upset, or excited, often so that you cannot think or behave normally: 2…. Learn more.

If you describe a decision or action as insane, you think it is very foolish or excessive.

Define insane. insane synonyms, insane pronunciation, insane translation, English dictionary definition of insane. afflicted with mental derangement, having a disordered mind, mad: Her bizarre threats …

Dec 26, 2025 · Adjective insane (comparative more insane or insaner, superlative most insane or insanest) Exhibiting unsoundness or disorder of mind; not sane; utterly mad. Synonyms: see …

WordReference Random House Unabridged Dictionary of American English © 2025 in•sane (in sān′), adj. not sane; not of sound mind; mentally deranged. of, pertaining to, or characteristic of a person …

Insane refers to a state of severe mental illness or mental disorder, characterized by a significant impairment in one's ability to think, reason, or perceive reality. It is often marked by unpredictable or …

insane, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

Jan 13, 2016 · To be insane is to have a seriously disordered state of mind. This is also a slang word for acting wacky or wild.