American English

Definition of Stygian adjective from the Oxford Advanced American Dictionary

 

Stygian

 adjective
adjective
NAmE//ˈstɪdʒiən//
 
[usually before noun] (literary)
 
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very dark, and therefore frightening Stygian gloom From the Styx, the river in the underworld that the souls of the dead had to cross in Greek myth.
See the Oxford Advanced Learner's Dictionary entry: Stygian