adusk vs joyless

adusk

adj

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

adv

  • At dusk; in the dusk or twilight. 

joyless

adj

  • without joy; unhappy, sad 

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