Dictionary and Thesaurus

Definition of Insane

• (a.) Exhibiting unsoundness or disorded of mind; not sane; mad; deranged in mind; delirious; distracted. See Insanity, 2.
• (a.) Used by, or appropriated to, insane persons; as, an insane hospital.
• (a.) Causing insanity or madness.
• (a.) Characterized by insanity or the utmost folly; chimerical; unpractical; as, an insane plan, attempt, etc.

Synonyms of Insane

• Harebrained
• Mad

Antonyms of Insane

• Sane

Homophones of Insane