silvery vs unpolluted

silvery

adj
  • Sprinkled or covered with silver. 

  • Having the clear, musical tone of silver; soft and clear in sound. 

  • Resembling silver in color, shiny white. 

unpolluted

adj
  • Not polluted; uncontaminated 

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