TENEBROUS
tenebrous, tenebrific, tenebrious
(adjective) dark and gloomy; “a tenebrous cave”
Source: WordNet® 3.1
Etymology
Adjective
tenebrous (comparative more tenebrous, superlative most tenebrous)
dark and gloomy
Source: Wiktionary
Ten"e*brous, a. Etym: [L. tenebrosus, fr. tenebrae darkness: cf. F.
ténébreux.]
Definition: Dark; gloomy; dusky; tenebrious.
– Ten"e*brous*ness, n.
The most dark, tenebrous night. J. Hall (1565).
The towering and tenebrous boughts of the cypress. Longfellow.
Source: Webster’s Unabridged Dictionary 1913 Edition