demoniacal

Definitions of demoniacal
1

adj frenzied as if possessed by a demon

Synonyms:
amok, amuck, berserk, demoniac, possessed
insane
afflicted with or characteristic of mental derangement

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.