• synonyms


[dih-moh-nee-ak, dee-muh-nahy-ak]
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adjective Also de·mo·ni·a·cal [dee-muh-nahy-uh-kuh l] /ˌdi məˈnaɪ ə kəl/.
  1. of, relating to, or like a demon; demonic: demoniac laughter.
  2. possessed by or as by an evil spirit; raging; frantic.
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  1. a person seemingly possessed by a demon or evil spirit.
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Origin of demoniac

1350–1400; Middle English < Late Latin daemoniacus < Greek daimoniakós, equivalent to daimóni(os) pertaining to a daemon + -akos -ac
Related formsde·mo·ni·a·cal·ly [dee-muh-nahy-ik-lee] /ˌdi məˈnaɪ ɪk li/, adverb


1. angelic.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for demoniacal

Historical Examples

  • Demoniacal possession was a mania in France in the seventeenth century.

    The Superstitions of Witchcraft

    Howard Williams

  • In the distance a coyote was making the night hideous with his demoniacal howlings.

    The Cave of Gold

    Everett McNeil

  • 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.


    Mary W. Shelley

British Dictionary definitions for demoniacal


adjective also: demoniacal (ˌdiːməˈnaɪəkəl)
  1. of, like, or suggestive of a demon; demonic
  2. suggesting inner possession or inspirationthe demoniac fire of genius
  3. frantic; frenzied; feverishdemoniac activity
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  1. a person possessed by an evil spirit or demon
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Derived Formsdemoniacally, adverb
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).

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Online Etymology Dictionary, © 2010 Douglas Harper