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de·mo·ni·ac(dĭ-mō′nē-ăk′) also de·mo·ni·a·cal (dē′mə-nī′ə-kəl)
1. Possessed, produced, or influenced by a demon: demoniac creatures.
2. Of, resembling, or suggestive of a devil; fiendish: demoniac energy; a demoniacal fit.
One who is or seems to be possessed by a demon.
[Middle English demoniak, from Late Latin daemoniacus, from Greek *daimoniakos, from daimonios, of a spirit, from daimōn, divine power; see demon.]
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.
(Theology) a person possessed by an evil spirit or demon
de•mo•ni•ac(dɪˈmoʊ niˌæk, ˌdi məˈnaɪ æk)
adj. Also, de•mo•ni•a•cal (ˌdi məˈnaɪ ə kəl)
1. of, pertaining to, or like a demon; demonic.
2. possessed by or as if by an evil spirit; raging; frantic.
[1350–1400; Middle English < Late Latin daemoniacus < Greek daimoniakós]
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|Noun||1.||demoniac - someone who acts as if possessed by a demon|
|Adj.||1.||demoniac - frenzied as if possessed by a demon; "the soldier was completely amuck"; "berserk with grief"; "a berserk worker smashing windows"|
insane - afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter"