Most Stygian refers to the darkest or gloomiest of places. Antonyms for this term would be bright or radiant, cheerful, or illuminated. If a place is not Stygian, it is likely to be filled with light and warmth. Synonyms for the term include dismal, gloomy, and somber, while antonyms for it can be described as joyful, lively, and brilliant. In summary, most Stygian is a term used to describe a place of darkness and gloom, while antonyms for it describe places that are bright, lively, and illuminated.