adjective
relating to the river Styx in Greek mythology; dark, gloomy, or forbidding
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The cave was filled with a Stygian darkness that seemed to swallow all light.
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The room was so dark, it felt like a Stygian pit.
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I hate going into that Stygian basement, it gives me the creeps.
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His mood was as Stygian as the storm clouds overhead.