impassionate vs passional

impassionate

adj
  • filled with passion; impassioned 

  • Lacking passion; dispassionate 

verb
  • to affect powerfully; to arouse the passions of 

passional

adj
  • characterized by passion 

noun
  • a book describing sufferings of martyrs 

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