Related Clues:

• Gloomy animal enclosure with tailless jumbo
• Dark and gloomy, like a river in Hades
• Dark, gloomy or hellish
• Dark and forbidding
• Dark and gloomy, like the mythological river Styx
• Staying out — it's hellishly dark
• Dark and dismal (like the rivers in Hell) — isn't gay (anag)