Relating to demons or demonic forces; characteristic of demons.
From demon + -ial (adjective suffix), directly from Latin daemon and Greek daimon. An alternative form to 'demonic'.
This is a rarer, more archaic synonym for 'demonic'—you'll find it mostly in older theological texts and fantasy literature trying to sound appropriately ancient and mystical.
Complete word intelligence in one call. Free tier — 50 lookups/day.