verdurous vs viridian

verdurous

adj
  • Freshly green; verdant; covered with verdure, or consisting of it. 

  • Having youthful or new qualities. 

viridian

adj
  • Of a bluish green colour. 

noun
  • A bluish-green pigment made from chromium sesquioxide. 

  • A bluish-green color. 

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