nonvirile vs pithless

nonvirile

adj
  • Not virile. 

  • Pertaining to a grammatical gender used in some Slavic languages for plurals of masculine animate, masculine inanimate, feminine, and neuter nouns, i.e. for all groups that do not include men or personal masculine nouns. 

pithless

adj
  • Not cogent. 

  • Lacking strength or pith; weak. 

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