Tenebrous

Ten"e*brous (?), a. [L. tenebrosus, fr. tenebrae darkness: cf. F. ténébreux.] 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.