diffident vs modest

diffident

adj
  • Lacking self-confidence; timid; modest 

modest

adj
  • Not bragging or boasting about oneself or one's achievements; unpretentious, humble. 

  • Intending to avoid the encouraging of sexual attraction in others. 

  • Pure and delicate from a sense of propriety. 

  • Small, moderate in size. 

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