Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted. See Insanity, 2.
- Of, exhibiting, or afflicted with insanity.
- Characteristic of or associated with persons afflicted with insanity: an insane laugh; insane babbling.
- Intended for use by such persons: an insane asylum.
- Immoderate; wild: insane jealousy.
- Very foolish; absurd: took insane risks behind the wheel.