6 adjectives to describe underworld

Ralph had never seen his way clearly in that dim underworld of affairs where men of the Moffatt and Driscoll type moved like shadowy destructive monsters beneath the darting small fry of the surface.

He was one with the toilers of earth, one with the crowded underworld.

At least I had to take them on trust as men, but they looked more like spectres who had risen from the tomb, or obscene creatures from some dreadful underworld.

But who knows what hideous lurking peril of mine or torpedo we have not survived, what baleful eye has not glowered at us, itself unseen, and retired again to its foul underworld, baulked of its thirsted prey? III.

What would not this waif from the grim underworld of New York have given for such clear eyes, pure mind and unsullied heart?

The stone cottage, as we have said, had an open, whitewashed arcade in front, from which one could look down into the gloomy depths of the gorge, as into some mysterious underworld.

6 adjectives to describe  underworld