tenebrosity

enUK

ten·e·brous

T0104700 (tĕn′ə-brəs) also te·neb·ri·ous (tə-nĕb′rē-əs)adj. Dark and gloomy.
[Middle English, from Old French tenebreus, from Latin tenebrōsus, from tenebrae, darkness.]
ten′e·bros′i·ty (-brŏs′ĭ-tē) n.