Noah Webster's Dictionary 1. (a.) Pertaining to hell; diabolical; as, infernal spirits, or conduct; suitable for hell, or to the character of the inhabitants of hell; hellish. 2. (a.) of or pertaining to or suitable for the lower regions, inhabited, according to the ancients, by the dead; pertaining to Pluto's realm of the dead, the Tartarus of the ancients. 3. (n.) An inhabitant of the infernal regions; also, the place itself.

Multi-Version Concordance Infernal (1 Occurrence) Philippians 2:10 that at the name of Jesus every knee should bow, of heavenly and earthly and infernal beings, (DBY)