assertive vs deferential

assertive

adj
  • Boldly self-assured; confident without being aggressive. 

deferential

adj
  • Based on deference; based on the doctrine, ideology, or wishes of others rather than one's own conclusions. 

  • Of, or relating to the vas deferens. 

  • Respectful and considerate; showing deference. 

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