Definitions from Wiktionary (infernal)

▸ adjective:  Of or relating to hell, or the world of the dead; hellish.
▸ adjective:  (by extension) Of or relating to a fire or inferno.
▸ adjective:  Stygian, gloomy.
▸ adjective:  Diabolical or fiendish.
▸ adjective:  (as an expletive) Very annoying; damned.
▸ noun:  An inhabitant of the infernal regions, a demon.

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