perverseness vs velleity

perverseness

noun
  • The quality of being perverse; doggedness, obstinacy. 

velleity

noun
  • The lowest degree of desire or volition; a total lack of effort to act. 

  • A slight wish not followed by any effort to obtain. 

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