'Stygian' definitions:

Definition of 'Stygian'

From: WordNet
adjective
Hellish; "Hence loathed Melancholy.../In Stygian cave forlorn"- Milton
adjective
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, Acherontic, Stygian]

Definition of 'Stygian'

From: GCIDE
  • Stygian \Styg"i*an\ (st[i^]j"[i^]*an), a. [L. Stygius, fr. Styx, Stygis, Gr. Sty`x, Stygo`s, the Styx.] Of or pertaining to the river Styx; hence, hellish; infernal. See Styx. [1913 Webster]
  • At that so sudden blaze, the Stygian throng Bent their aspect. --Milton. [1913 Webster]