STYGIAN

gloomy, dark

hellish

dark and dismal
ANT - supernal

"He had no desire to spend time with the stygian crowd that usually attended such discussions."

"He was in a stygian state after the break up, but he knew that in this darkness there was profundity so for that he was thankful."

"He no longer had that life net, that warm illusion of someone always being there even in stygian moments like this."