Stygian means very dark and gloomy. Stygian gloom, stygian darkness, a stygian tunnel.
It is a literary word and almost always pairs with gloom or darkness. It comes from the Styx, the river of the Greek underworld, by which even the gods swore their unbreakable oaths. Note that it is often written with a capital, as names-turned-adjectives usually are at first.
1adjectivestygianVery dark and gloomy.
“The cave was stygian, and we couldn't see our own hands without the torch.”
stygian is a quality of darkness.
From Greek Stygios, of the Styx, the chief river of the underworld, by which the gods swore their oaths.
Ancient Greek
Στύγιος — relating to Styx
English, today
stygian
Built from
From stygius + -ian, from Ancient Greek Στύγιος (“relating to Styx”), from Στύξ (“Styx, chief river of underworld”).
Etymology from Wiktionary, CC BY-SA
Practised in A Song of Ice and Fire