(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.