kiasi vs retromingent

kiasi

adj
  • Unwilling to take a chance for fear that something bad or unfavourable will happen; cowardly. 

noun
  • A kiasi person. 

retromingent

adj
  • Cowardly. 

  • That urinates backwards; also used of such urination. 

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