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Definition of insane:

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


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