foul play vs passivity

foul play

noun
  • Any violation of rules. 

  • Unfair, unethical, or criminal behavior, especially of a malicious or violent nature. 

passivity

noun
  • A lack of initiative. 

  • The state of being passive. 

  • Submissiveness. 

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