Synonyms: demoniac
Definition: someone who acts as if possessed by a demon
Synonyms: amok, amuck, berserk, demoniac, demoniacal, possessed
Definition: frenzied as if possessed by a demon
Usage: the soldier was completely amuck; berserk with grief; a berserk worker smashing windows
Similar words: insane
Definition: afflicted with or characteristic of mental derangement
Usage: was declared insane; insane laughter