DARKENING
Dark"en*ing, n.
Defn: Twilight; gloaming. [Prov. Eng. & Scot.] Wright.
DARKFUL
Dark"ful, a.
Defn: Full of darkness. [Obs.]
DARKISH
Dark"ish, a.
Defn: Somewhat dark; dusky.
DARKLE
Dar"kle, v. i. Etym: [Freq. of dark.]
Defn: To grow dark; to show indistinctly. Thackeray.
DARKLING
Dark"ling, adv. Etym: [Dark + the adverbial suffix -ling.]
Defn: In the dark. [Poetic]
So, out went the candle, and we were left darkling. Shak.
As the wakeful bird Sings darkling. Milton.