DEMONIAC

demoniac. Demoniac, n. one who is possessed with a demon

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{ De‐mo″ni‐ac (?), Dem′o‐ni″a‐cal (?; 277), } a. [[L. daemoniacus, fr. daemon; cf. F. démoniaque. See Demon.]] 1. 1. Pertaining to, or characteristic of, a demon or evil spirit; devilish; as, a demoniac being; demoniacal practices.
Sarcastic, demoniacal laughter. Thackeray. 2. 2. Influenced or produced by a demon or evil spirit; as, demoniac or demoniacal power. “Demoniac frenzy.” Milton.