say it: STIJ-ee-uhn
stygian is an adjective meaning "hellish". It carries 2 recorded senses.
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”
Definitions, synonyms and semantic relations for stygian come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.