adusk vs dingy

adusk

adj

  • Resembling conditions at dusk or twilight, low-lit, dark; in darkness, gloomy. 

adv

  • At dusk; in the dusk or twilight. 

dingy

adj

  • dark, dull 

  • shabby, squalid, uncared-for 

How often have the words adusk and dingy occurred in a corpus of books? (source: Google Ngram Viewer )