Noah Webster
Demoniac
DEMONIAC or DEMONIACAL or DEMONIAN, adjective
1. Pertaining to demons or evil spirits.
2. Influenced by demons; produced by demons or evil spirits.
DEMONIAC phrensy.
DEMONIAC, noun A human being possessed by a demon; one whose volition and other mental faculties are overpowered, restrained, or disturbed, in their regular operation, by an evil spirit, or by a created spiritual being of superior power.