Definition of stygian
1 : of or relating to the river Styx
2 : extremely dark, gloomy, or forbidding <the stygian blackness of the cave>
Examples of stygian
<lost in the stygian reaches of the deep forest>
Origin of stygian
Latin stygius, from Greek stygios, from Styg-, Styx Styx
First Known Use: 1513
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