nebulous vs roky

nebulous

adj
  • In the form of a cloud or haze; hazy. 

  • Vague or ill-defined. 

  • Relating to a nebula or nebulae. 

roky

adj
  • Misty; foggy; cloudy. 

  • Exhibiting roke (a defect in steel ingots). 

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