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.

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.

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 …

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 …

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

exceptionally foolish or senseless. It was an insane scheme that had no chance of being successful. Going up on the roof during that storm was an insane thing to do. (informal) …

Oct 8, 2025 · (slang) Extremely good; incredibly amazing. quotations That guy is insane at FPS games.

insane (informal) having a mind that does not work normally: If I have to stay any longer, I'll go insane. Insane is also used as a legal term for someone who is not responsible for a crime …