acherontic
1. [ adjective ] dark and dismal as of the rivers Acheron and Styx in Hades
Synonyms: Stygian Acheronian
Examples:

"in the depths of an Acheronian forest" "upon those roseate lips a Stygian hue"-Wordsworth

Related terms: dark
Similar spelling:   Acheron
  Acherontia
  achromatic
  Acheronian
  achromic
  achromatinic
  acronymic
  acromicria
  achromatin
  achromatize
  achromatism
  achromatise
  acromion