stygian

From Latin stygius, from Ancient Greek Στύγιος (Stúgios, “relating to Styx”), from Στύξ (Stúx, “Styx, chief river of underworld”).

• (UK, US) IPA^(key): /ˈstɪdʒ.i.ən/

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stygian (comparative more stygian, superlative most stygian)

1. Dark and gloomy.
   • 1918, Edgar Rice Burroughs, The Gods of Mars‎, HTML edition, The Gutenberg Project, published 2008:

     The things which the Stygian darkness hid from my objective eye …

2. Infernal or hellish.

• See also Stygian, which means "of, by or relating to the river Styx".

• staying