The meaning of INSANE is exhibiting a severely disordered state of mind. How to use insane in a sentence. INSANE definition: 1.

Understanding the Context

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.

Key Insights

insane synonyms, insane pronunciation, insane translation, English dictionary definition of insane. afflicted with mental derangement, having a disordered mind, mad: Her bizarre threats were the result of an insane jealousy. insane, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary Adjective insane (comparative more insane or insaner, superlative most insane or insanest) Exhibiting unsoundness or disorder of mind; not sane; utterly mad.

Final Thoughts

Synonyms: see Thesaurus: insane 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 who is mentally deranged: insane actions; an insane asylum. utterly senseless: an insane plan. People who are insane are suffering from a seriously irrational or disordered state of mind. When someone commits a crime, it's important to know if they were sane or insane.