pusillanimity vs strong-mindedness

pusillanimity

noun
  • The quality or state of being pusillanimous; the vice of being timid and cowardly, and thus not living up to one's full potential; pusillanimousness. 

strong-mindedness

noun
  • the state or quality of being strong-minded. 

How often have the words pusillanimity and strong-mindedness occurred in a corpus of books? (source: Google Ngram Viewer )