obtund vs paralyze

obtund

verb
  • To reduce the edge or effects of; to mitigate; to dull. 

paralyze

verb
  • To render unable to move; to immobilize. 

  • To afflict with paralysis. 

  • To render unable to function properly. 

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