insane

a. [ L. insanus. See In- not, and Sane. ] 1. Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted. See Insanity, 2. [ 1913 Webster ]

2. Used by, or appropriated to, insane persons; as, an insane hospital. [ 1913 Webster ]

3. Causing insanity or madness. [ R. ] [ 1913 Webster ]

Or have we eaten on the insaneroot
That takes the reason prisoner ? Shak. [ 1913 Webster ]

4. Characterized by insanity or the utmost folly; chimerical; unpractical; as, an insane plan, attempt, etc. [ 1913 Webster ]

I know not which was the insane measure. Southey. [ 1913 Webster ]