probity vs straightness

probity

noun
  • Integrity, especially of the quality of having strong moral principles; decency and honesty. 

straightness

noun
  • The state or quality of being straight (especially in the sense of "heterosexual"). 

  • The result or product of being straight. 

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