impassionate vs wistful

impassionate

adj
  • filled with passion; impassioned 

  • Lacking passion; dispassionate 

verb
  • to affect powerfully; to arouse the passions of 

wistful

adj
  • Full of longing or yearning. 

  • Sad and thoughtful. 

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