7 letters · 11 points in Scrabble
adjective hellish; - Milton
adjective dark and dismal as of the rivers Acheron and Styx in Hades; ; -Wordsworth
originFrom Latin stygius, from Ancient Greek Στύγιος (Stúgios, “relating to Styx”), from Στύξ (Stúx, “Styx, chief river of underworld”).
Etymology from Wiktionary, CC BY-SA 3.0