Stygian
Pronunciation : Styg"i*an
Part of Speech : a.
Etymology : [L. Stygius, fr. Styx, Stygis, Gr.
Definition : Defn: Of or pertaining to the river Styx; hence, hellish; infernal. See Styx. At that so sudden blaze, the Stygian throng Bent their aspect. Milton.
Source : Webster's Unabridged Dictionary, 1913