nubilous vs roky

nubilous

adj

  • Cloudy, misty. 

  • Unclear. 

roky

adj

  • Misty; foggy; cloudy. 

  • Exhibiting roke (a defect in steel ingots). 

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