stygian

/ˈstɪdʒiən/
adjective
  1. Extremely dark, gloomy, or forbidding.
    • The cave was stygian, with no light reaching its deepest chambers.
    • The old mansion had a stygian atmosphere that frightened the children.
    • A stygian fog settled over the city, making the streets feel haunted.
  2. Relating to the River Styx in Greek mythology, or to the underworld.
    • In ancient myths, the stygian waters of the River Styx separated the living from the dead.
    • She described the dream as a stygian landscape of shadows and silence.
    • The hero made a stygian journey to the underworld to rescue his friend.
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