Demoniac /(?)/

De·mo·ni·ac

Demoniac

a.
  1. Pertaining to, or characteristic of, a demon or evil spirit; devilish; as, a demoniac being; demoniacal practices.
    Sarcastic, demoniacal laughter.
  2. Influenced or produced by a demon or evil spirit; as, demoniac or demoniacal power.
  3. resembling or suggesting possession by a demon; as, demoniac energy.
  4. in a murderous frenzy as if possessed by a demon.

Demoniac

n.
  1. A human being possessed by a demon or evil spirit; one whose faculties are directly controlled by a demon.
    The demoniac in the gospel was sometimes cast into the fire.
    — Bates.
  2. One of a sect of Anabaptists who maintain that the demons or devils will finally be saved. (Eccl. Hist.)