Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
demoniacal is an adjective meaning "of, pertaining to, or like a demon or possession by a demon". It carries one recorded sense.
Definitions, synonyms and semantic relations for demoniacal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.