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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 …

5 days ago · Adjective insane (comparative more insane or insaner, superlative most insane or insanest) Exhibiting unsoundness or disorder of mind; not sane; utterly mad. Synonyms: see Thesaurus: insane

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

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

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.