“sti-gee-an” | /ˈstɪdʒ.i.ən/
adj – Dark and gloomy. Hellish. Relating to the River Styx.
“Each year, we go to a haunted house well-known for its stygian design.”
From Latin stygius, from Ancient Greek Στύγιος (Stúgios, “relating to Styx”), from Στύξ (Stúx, “Styx, chief river of underworld”).