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1.
Dark, gloomy, murky, difficult to understand, difficult to see through, or obscure.

Rarely, if ever seen, even in literature, considered a "Prolix" or "Verbose" word that may never be used even by the wordiest of authors.
Praise the tenebrous Cthulhu, may his name forever be spoken across the land.
by Hail Cthulhu June 26, 2011