clouded vs crepuscular

clouded

adj
  • Made dim or blurry. 

  • Variegated with spots. 

  • Filled with clouds. 

  • Unclear; surrounded in mystery. 

crepuscular

adj
  • Of or resembling twilight; dim. 

  • Active at or around dusk, dawn or twilight. 

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