adusk vs darkened

adusk

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

adv
  • At dusk; in the dusk or twilight. 

darkened

adj
  • Having an absence of light, such as at night-time. 

  • Made dark or lightproof by the exclusion of light. 

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