insipidity vs prosaicism

insipidity

noun
  • Something that is insipid; an insipid utterance, sight, object, etc. 

  • The condition of being insipid; insipidness. 

prosaicism

noun
  • The quality or state of being prosaic; a prosaic manner or style. 

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