I. də̇ˈmōnēˌak, dēˈ- also -ˈmän- sometimes |dēmə|nīˌak or -īək adjective
also de·mo·ni·a·cal |dēmə|nīəkəl
Etymology: demoniac from Middle English demoniak, from Late Latin daemoniacus, from Greek daimoniakos, from daimonios of a daimon, from daimon-, daimōn demon; demoniacal from Late Latin daemoniacus + English -al — more at demon
1. : influenced or produced by a demon : possessed by an evil spirit
through the demoniac ambivalence of the passions, which make actions a pursuit of chimeras — Fritz Kaufmann
a lunatic who is thinking of some demoniac buffoonery in his muddled brain — Liam O'Flaherty
2. : of, belonging to, or having the characteristics of a demon : fiendish , devilish
possessed with demoniac energy
• de·mo·ni·a·cal·ly -k(ə)lē, -li adverb
II. noun
( -s )
Etymology: Middle English demoniak, from Late Latin daemoniacus, from daemoniacus, adjective
: one regarded as possessed by an evil spirit