acheronian

1. Dark and dismal as of the rivers Acheron and Styx in Hades (synset 300274518)
   "in the depths of an Acheronian forest"; "upon those roseate lips a Stygian hue"
   similar to: dark - devoid of or deficient in light or brightness; shadowed or black
   same as: acherontic, stygian

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