tenebrific
\ ten-uh-BRIF-ik \ , adjective;
1.producing darkness.
Quotes:
They shine like suns, these two, amid multitudes of watery comets and tenebrific constellations, too sorrowful without such admixture on occasion!
-- Thomas Carlyle, Thomas Carlyle to Ralph Waldo Emerson, October 31, 1843, in The Correspondence of Thomas Carlyle and Ralph Waldo Emerson, 1834–1872
Jane's eyes were sad-making, not weak, not really sullen, but cheerless, tenebrific .
-- Percival Everett, "I Am Not Sidney Poitier ," 2009
Origin:
Tenebrific comes from the Latin term tenebrae meaning "darkness." The suffix -fic is used in formation of adjectives borrowed from Latin and it means “making,” “producing,” “causing." Tenebrific entered English in the late 1600s.