Cimmerian

a.	1.	Pertaining to the Cimmerii, a fabulous people, said to have lived, in very ancient times, in profound and perpetual darkness.
	2.	Without any light; intensely dark. In dark Cimmerian desert ever dwell. - Milton.

Adj.

1.

Cimmerian - intensely dark and gloomy as with perpetual darkness; "the Cimmerian gloom...a darkness that could be felt"-Norman Douglas

dark