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tenebrous (adj.)

"full of darkness," late 15c., from Old French tenebros "dark, gloomy" (11c., Modern French ténébreux), from Latin tenebrosus "dark," from tenebrae "darkness" (see temerity). Related: Tenebrosity.

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Definitions of tenebrous

tenebrous (adj.)
dark and gloomy;
a tenebrous cave
Synonyms: tenebrific / tenebrious
From wordnet.princeton.edu