stygian

Adjective
  1. Hellish (synset 301307185)
    "Hence loathed Melancholy.../In Stygian cave forlorn"
  2. 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"

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