adv. [ Dark + the adverbial suffix -ling. ] In the dark. [ Poetic ] [ 1913 Webster ]
So, out went the candle, and we were left darkling. Shak. [ 1913 Webster ]
As the wakeful bird
Sings darkling. Milton. [ 1913 Webster ]
p. pr. & a.
His honest brows darkling as he looked towards me. Thackeray. [ 1913 Webster ]