Extremely dark or gloomy; characterized by deep darkness or obscurity. Often used to describe both literal darkness and metaphorical gloom.
From the Cimmerians, a mythical people in Homer's Odyssey who lived in perpetual darkness beyond the ocean. The word entered English through Latin, maintaining its association with impenetrable darkness and mystery.
Remember 'cinema' - early movie theaters were cimmerian dark! The Cimmerians were so associated with darkness that their name became synonymous with any deep, mysterious gloom.
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