demoniacal
1. [ adjective ] in a murderous frenzy as if possessed by a demon
Synonyms: amok berserk demoniac possessed amuck
Examples:

"the soldier was completely amuck" "berserk with grief" "a berserk worker smashing windows"

Related terms: insane
2. [ adjective ] resembling or suggesting possession by a demon
Synonyms: demoniac
Examples:

"demoniac energy" "a demoniacal fit"

Related terms: agitated
Similar spelling:   demoniacally
  demoniac
  demonic
  demonize
  demonism
  demonise
  demonization
  demonisation