a. [ L. tenebrosus, fr. tenebrae darkness: cf. F. ténébreux. ] Dark; gloomy; dusky; tenebrious. -- Ten"e*brous*ness, n. [1913 Webster]
The most dark, tenebrous night. J. Hall (1565). [1913 Webster]
The towering and tenebrous boughts of the cypress. Longfellow. [1913 Webster]