STYGIAN Meaning of STYGIAN in English adj.1 (in Greek mythology) of or relating to the Styx, a river in Hades. 2 literary dark, gloomy, indistinct. Etymology: L stugius f. Gk stugios f. Stux -ugos Styx f. stugnos hateful, gloomy Oxford English vocab. Оксфордский английский словарь. 2012