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.

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

demoniacally de'mo·ni'a·cal·ly adv.

Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: someone who acts as if possessed by a demon

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The adjective demoniac has 2 meanings:

Meaning #1: in a murderous frenzy as if possessed by a demon
  Synonyms: amuck, amok, berserk, demoniacal, possessed

Meaning #2: resembling or suggesting possession by a demon
  Synonym: demoniacal

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Dansk (Danish)
adj. - rasende, besat, dæmonisk, djævelsk
n. - besat person

Nederlands (Dutch)
duivels, bezeten (ook figuurlijk)

Français (French)
adj. - diabolique, démoniaque
n. - diabolique, démoniaque

Deutsch (German)
adj. - teuflisch
n. - Besessene

Ελληνική (Greek)
adj. - δαιμονιώδης, διαβολικός

Italiano (Italian)
demoniaco

Português (Portuguese)
adj. - demoníaco

Русский (Russian)
демонический

Español (Spanish)
adj. - demoníaco, diabólico, endemoniado
n. - endemoniado

Svenska (Swedish)
adj. - demonisk, djävulsk

中文（简体） (Chinese (Simplified))
魔鬼的, 着魔的, 恶魔的, 着魔的人

中文（繁體） (Chinese (Traditional))
adj. - 魔鬼的, 著魔的, 惡魔的
n. - 著魔的人

한국어 (Korean)
adj. - 악마 들린, 흉악한
n. - 악마 들린 사람

日本語 (Japanese)
adj. - 悪魔の, 悪魔に取りつかれた

العربيه (Arabic)
‏(صفه) شيطاني‏

עברית (Hebrew)
adj. - ‮שטני, מטורף‬
n. - ‮אחוז דיבוק רע‬

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