insipidity vs trenchancy

insipidity

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

  • The condition of being insipid; insipidness. 

trenchancy

noun
  • The quality of being trenchant. 

  • Irony or bitterness of tone. 

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