Ach·e·ron·tic a. Of or pertaining to Acheron; infernal; hence, dismal, gloomy; moribund.
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  Acherontic
       adj : dark and dismal as of the rivers Acheron and Styx in Hades;
             "in the depths of an Acheronian forest"; "upon those
             roseate lips a Stygian hue"-Wordsworth [syn: Acheronian,
              Stygian]