caitiff vs retromingent

caitiff

adj

  • Especially despicable; cowardly 

noun

  • A base or despicable person; a wretch 

retromingent

adj

  • Cowardly. 

  • That urinates backwards; also used of such urination. 

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