Insane

Part of speech: adjective (a.)

1. Exhibiting unsoundness or disorded 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 Shak.

4. Characterized by insanity or the utmost folly; chimerical; unpractical; as, an insane plan, attempt, etc. I know not which was the insane measure. Southey.