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