Word Study
tenebrous
CIDE DICTIONARY
tenebrous, a. [L. tenebrosus, fr. tenebrae darkness: cf. F. ténébreux.].
Dark; gloomy; dusky; tenebrious. [1913 Webster]
"The most dark, tenebrous night." [1913 Webster]
"The towering and tenebrous boughts of the cypress." [1913 Webster]
OXFORD DICTIONARY
tenebrous, adj. literary dark, gloomy.
Etymology
ME f. OF tenebrus f. L tenebrosus (as TENEBRAE)
THESAURUS
tenebrous
ambiguous, amphibological, beamless, black, black as night, caliginous, dark, dark as night, dark as pitch, darkling, darksome, dim, dusk, dusky, ebon, ebony, eclipsed, equivocal, gloomy, murky, night-black, night-clad, night-cloaked, night-dark, night-enshrouded, night-filled, night-mantled, night-veiled, obfuscated, obscure, obscured, occulted, pitch-black, pitch-dark, pitchy, rayless, sibylline, starless, sunless, tenebrious, tenebrose, uncertain, unclear, unilluminated, unintelligible, unlighted, unlit, vagueFor further exploring for "tenebrous" in Webster Dictionary Online