dullness vs numbness

dullness

noun
  • Lack of interest or excitement. 

  • 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. 

  • The lack of visual brilliance; want of sheen. 

  • bluntness. 

numbness

noun
  • Inability or reduced ability to experience emotion. 

  • Absent or reduced sensitivity to cutaneous stimulation. 

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