insubstantial vs nonvirile

insubstantial

adj
  • Lacking substance; not real or strong. 

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. 

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