Cimmerian

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Very dark or gloomy.
• noun One of a mythical people described by Homer as inhabiting a land of perpetual darkness.

from The Century Dictionary.

• Pertaining to the Cimmerii, a mythical people mentioned by Homer as dwelling “beyond the ocean-stream, where the sun never shines, and perpetual darkness reigns.”
• Hence Very dark; obscure; gloomy.
• Pertaining to the Cimmerii, a nomadic people of antiquity dwelling in the Crimea, near the sea of Azof, and in the country of the lower Volga, and perhaps, from some vague knowledge, the original of the mythical Cimmerii.
• noun One of the Cimmerii, in either the mythical or the historical application of that name.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Pertaining to the Cimmerii, a fabulous people, said to have lived, in very ancient times, in profound and perpetual darkness.
• adjective Without any light; intensely dark.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Greek mythology Any of the mythical people supposed to inhabit a land of perpetual darkness.
• noun one of the Cimmerii, ancient equestrian nomads of Indo-European origin
• noun historical the prophetic priestess presiding over the Apollonian Oracle at Cimmerium in Italy.
• adjective Pertaining to the ancient Cimmerians.
• adjective Characteristic of Cimmeria; especially describing particularly dense darkness etc.
• proper noun the language of the Cimmerians, possibly belonging to the Iranian branch

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective intensely dark and gloomy as with perpetual darkness