dastard vs retromingent

dastard

adj
  • Meanly shrinking from danger, cowardly, dastardly. 

noun
  • A malicious coward; a dishonorable sneak. 

verb
  • To dastardize. 

retromingent

adj
  • Cowardly. 

  • That urinates backwards; also used of such urination. 

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