back-alley vs shrouded

back-alley

adj
  • Occurring away from publicity, or in mean surroundings; backstreet. 

shrouded

adj
  • Concealed or hidden from sight, as if by a shroud. 

  • Wearing, or provided with a shroud. 

How often have the words back-alley and shrouded occurred in a corpus of books? (source: Google Ngram Viewer )