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

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

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

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

Definition of insane adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

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

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 meaning: 1 : not sane: such as; 2 : having or showing severe mental illness

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 …

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