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Adjective: Stygian  sti-jee-un
  1. Dark and dismal as of the rivers Acheron and Styx in Hades
    "upon those roseate lips a Stygian hue";
    - Acheronian, Acherontic
  2. Hellish
    "Hence loathed Melancholy.../In Stygian cave forlorn"

See also: dark, infernal

Encyclopedia: Stygian