Insane /(?)/

In·sane

Insane

a.
  1. Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted. See Insanity, 2.
  2. Used by, or appropriated to, insane persons; as, an insane hospital.
  3. Causing insanity or madness. [R.]
    Or have we eaten on the insaneroot That takes the reason prisoner ?
  4. Characterized by insanity or the utmost folly; chimerical; unpractical; as, an insane plan, attempt, etc.
    I know not which was the insane measure.