adusk vs cimmerian

adusk

adj

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

adv

  • At dusk; in the dusk or twilight. 

cimmerian

adj

  • perpetually dark or gloomy 

  • mentally dark; ignorant 

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