Top definition
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
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2
The state of being gloomy or causing gloom, in a vague (imprecisely communicated) or vaguely menacing way.
John had stayed in his room for days, scrawling tenebrous sentences like ''the darkness is coming. Nobody is safe from it. The world will never be the same again.'' He was later found dead, supposedly having committed suicide.
by WhiteWarlock May 14, 2016
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