Demoniacism refers to the state of being possessed by a demon, and as such, antonyms for this word would be those that describe the opposite state, such as purity, innocence, and holiness. A person who is free from the influence of demons may be considered to be moral or virtuous. Other antonyms for demoniacism might include sobriety, sanity, and rationality. These words describe a state of mind that is clear, focused, and in control, with a sound mind and a balanced approach to life. While demoniacism is associated with disorder, chaos, and evil, its antonyms represent a state of being that is calm, ordered, and balanced.