(1):

(a.) Used by, or appropriated to, insane persons; as, an insane hospital.

(2):

(a.) Characterized by insanity or the utmost folly; chimerical; unpractical; as, an insane plan, attempt, etc.

(3):

(a.) Exhibiting unsoundness or disorded of mind; not sane; mad; deranged in mind; delirious; distracted. See Insanity, 2.

(4):

(a.) Causing insanity or madness.