Answer: stygian

AnswerCrossword Clue
STYGIANHellish, in the Greek sense
STYGIANDark and gloomy
STYGIANLike Charon's world
STYGIANDark.
STYGIANGloomy as the infernal river.
STYGIANInfernal.
STYGIANGloomy
STYGIANHellish
STYGIANDark and forbidding
stygiandark or gloomy
stygianof or pertaining to the river Styx or to Hades
stygianinfernal; hellish