1) Dark 2) Exclusively Saxon word 3) Exclusively Anglo word 4) Growing dim 5) Word with Anglo-Saxon origins 6) Word of purely Anglo origin 1) Dark 
• (adv.) In the dark. • (p. pr. & a.) Dark; gloomy. • (p. pr. & a.) Becoming dark or gloomy; frowing.
Dark'ling adverb [ Dark + the adverbial suffix -ling .] In the dark. [ Poetic] « So, out went the candle, and we were left darkling .» Shak. « As the wakeful bird Sings darkling .» Milton. Dark'ling present participle & adjective 1. Becoming dark or gloomy; frowing. « His honest brows darkling as he looked towards me.» Thackeray. 2. Dark; gloomy. 'The darkling precipice.' Moore. 
[adj] - uncannily or threateningly dark or obscure 2. [adj] - (poetic) occurring in the dark or night