demoniacal

de·mo·ni·ac  (d-mn-k) also de·mo·ni·a·cal (dm-n-kl)

adj.

1. Possessed, produced, or influenced by a demon: demoniac creatures.

2. Of, resembling, or suggestive of a devil; fiendish: demoniac energy; a demoniacal fit.

n.

One who is or seems to be possessed by a demon.

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[Middle English demoniak, from Late Latin daemoniacus, from Greek *daimoniakos, from daimonios, of a spirit, from daimn, divine power; see demon.]

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demo·nia·cal·ly adv.

Thesaurus

Adj.

1.

demoniacal - frenzied as if possessed by a demon; "the soldier was completely amuck"; "berserk with grief"; "a berserk worker smashing windows" amok, amuck, berserk, demoniac, possessed insane - afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter"