tenebrous

The Republicans, however, sat with tenebrous expressions that matched the black curtain hiding their legs.

I can't recall any other detail, but the whole atmosphere was tenebrous and sinister.

Winged things that were not bats swooped and fluttered in the tenebrous air, whispering sibilantly—whispering in human voices.

The room was well illuminated with gas, whatever might be going on in the streets; to no tenebrous repast were we invited.

Our town was indeed but one vast hospital—orderly, subdued, and tenebrous.

Never had she looked to Ray so like an eagle, so keen, so fierce, so fit for braving either sun or tenebrous cavern.