[di:mә'naiәk(ә)l]
n.
着魔之人, 狂暴者

[ adj ]
frenzied as if possessed by a demon
<adj.all>
the soldier was completely amuckberserk with grief
a berserk worker smashing windows

Demoniac \De*mo"ni*ac\, Demoniacal \Dem`o*ni"a*cal\ (?; 277), a.
[L. daemoniacus, fr. daemon; cf. F. d['e]moniaque. See
{Demon}.]
1. Pertaining to, or characteristic of, a demon or evil
spirit; devilish; as, a demoniac being; demoniacal
practices.

Sarcastic, demoniacal laughter. --Thackeray.

2. Influenced or produced by a demon or evil spirit; as,
demoniac or demoniacal power. ``Demoniac frenzy.''
--Milton.

3. resembling or suggesting possession by a demon; as,
demoniac energy.
[WordNet 1.5]

4. in a murderous frenzy as if possessed by a demon.

Syn: amuck, amok, berserk, demoniac, possessed(predicate).
[WordNet 1.5]