demoniacal

/ˌdiːməˈnaɪəkəl/
adjective
  1. Extremely evil, cruel, or wicked; like a demon.
    • The villain's demoniacal laugh echoed through the empty hall.
    • She described the dictator's actions as demoniacal and without mercy.
    • In the movie, the character's demoniacal plan involved destroying the entire city.
  2. Wildly energetic or frenzied, often in a disturbing way.
    • His demoniacal enthusiasm for the project exhausted everyone around him.
    • The dancer moved with demoniacal energy, spinning faster and faster.
    • The crowd's demoniacal cheering grew louder as the band played its final song.
Antonyms
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