ten·e·brous 
(tĕnə-brəs) also te·neb·ri·ous (tə-nĕbrē-əs)
(tĕnə-brəs) also te·neb·ri·ous (tə-nĕbrē-əs)adj.
Dark and gloomy.
[Middle English, from Old French tenebreus, from Latin tenebrōsus, from tenebrae, darkness.]
ten′e·brosi·ty (-brŏsĭ-tē) n.