dullness vs penetration

dullness

noun
  • The quality of not perceiving or kenning things distinctly. 

  • The quality of being uninteresting; boring; humorless or irksome. 

  • The quality of being slow of understanding things; stupidity. 

  • Lack of interest or excitement. 

  • The lack of visual brilliance; want of sheen. 

  • bluntness. 

penetration

noun
  • Specifically, the insertion of the penis (or similar object) during sexual intercourse. 

  • The act of penetrating something. 

  • The act of penetrating a given situation with the mind or faculties; perception, discernment. 

  • A number or fraction that represents how many cards/decks will be dealt before shuffling, in contrast to the total number of cards/decks in play. 

  • The proportion of the target audience who buy the advertised product or service. 

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