Why this word is great
DEMONIAC — [Adjective] Possessed or controlled by a demon, or of or pertaining to demons. From Middle English, from Old French demoniaque, from Late Latin daemoniacus, from Greek daimonikos, from daimon ("spirit, deity, demon"). Unlike "demonic," which broadly describes the inherent qualities of a devil, or "fiendish," which emphasizes human cruelty, "demoniac" captures the violent usurpation of a human vessel by an external, supernatural force. It is the unnerving cadence of a voice that is and is not the speaker's, the convulsive strength that shatters holy bonds, and the sudden, fluent cursing in a blasphemous dead tongue from a child's mouth—a portrait not of evil's essence, but of its terrible, intimate occupancy, where the self is evicted from its own flesh.