infernal

infernal is an Adverb

Definition:

[1] 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. The Elysian fields, the infernal monarchy. Garth.

[2] Of or pertaining to, resembling, or inhabiting, hell; suitable for hell, or to the character of the inhabitants of hell; hellish; diabolical; as, infernal spirits, or conduct. The instruments or abettors in such infernal dealings. Addison. Infernal machine, a machine or apparatus maliciously designed to explode, and destroy life or property. -- Infernal stone (lapis infernalis), lunar caustic; formerly so called. The name was also applied to caustic potash.