- of, relating to, or like a demon; demonic: demoniac laughter.
- possessed by or as by an evil spirit; raging; frantic.
- a person seemingly possessed by a demon or evil spirit.
Origin of demoniac
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for demoniacal
Demoniacal possession was a mania in France in the seventeenth century.The Superstitions of Witchcraft
In the distance a coyote was making the night hideous with his demoniacal howlings.The Cave of Gold
They also believe in the existence of a demoniacal hierarchy.
It is now believed that the patient is free from all demoniacal attacks.
The completion of my demoniacal design became an insatiable passion.Frankenstein
Mary W. Shelley
- of, like, or suggestive of a demon; demonic
- suggesting inner possession or inspirationthe demoniac fire of genius
- frantic; frenzied; feverishdemoniac activity
- a person possessed by an evil spirit or demon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for demoniacal
c.1400, "possessed, insane," earlier (late 14c.) as a noun, "one who is possessed," from Late Latin daemoniacus (c.200), from Greek daimoniakos "possessed by a demon," from diamon (see demon).
Online Etymology Dictionary, © 2010 Douglas Harper