Dictionary.com
Thesaurus.com
Synonyms

demoniac

American  
[dih-moh-nee-ak, dee-muh-nahy-ak] / dɪˈmoʊ niˌæk, ˌdi məˈnaɪ æk /

adjective

  1. of, relating to, or like a demon; demonic.

    demoniac laughter.

    Antonyms:
    angelic
  2. possessed by or as by an evil spirit; raging; frantic.


noun

  1. a person seemingly possessed by a demon or evil spirit.

demoniac British  
/ dɪˈməʊnɪˌæk /

adjective

  1. of, like, or suggestive of a demon; demonic

  2. suggesting inner possession or inspiration

    the demoniac fire of genius

  3. frantic; frenzied; feverish

    demoniac activity

"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

noun

  1. 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

Other Word Forms

  • demoniacally adverb

Etymology

Origin of demoniac

1350–1400; Middle English < Late Latin daemoniacus < Greek daimoniakós, equivalent to daimóni ( os ) pertaining to a daemon + -akos -ac

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

His demoniac speed and guile were crucial in the quarterfinals when the Springboks edged France two weeks ago.

From Washington Times

“The national honor elated the demoniac,” Ford wrote.

From Washington Post

This was a demoniac laugh—low, suppressed, and deep—uttered, as it seemed, at the very keyhole of my chamber door.

From Literature

The demoniac wizards and the hideous old witches who haunted Europe and America, too, up to quite recent years, play no part at all in the stories.

From Literature

Memes of his demoniac look, arms crossed across his chest, had gone viral, as did the gif of him dancing with a woman in the crowd.

From The Guardian