verdurous vs vernal

verdurous

adj
  • Having youthful or new qualities. 

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

vernal

adj
  • Having characteristics like spring; fresh, young, youthful. 

  • Pertaining to or occurring in spring. 

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