insensitive vs pachydermatous

insensitive

adj
  • Not expressing normal emotional feelings; cold; tactless; undiplomatic 

  • Expressing or feeling little or no concern, care, compassion, or consideration for the feelings, emotions, sentiments, or concerns of other people; inconsiderate or incompassionate 

  • Not expressing normal physical feeling; 

pachydermatous

adj
  • Thick-skinned; insensitive. 

  • Of or relating to the pachyderms. 

  • Like an elephant 

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