clandestine vs truthful

clandestine

adj
  • Done or kept in secret, sometimes to conceal an illicit or improper purpose. 

  • Not recognized as a regular member. 

truthful

adj
  • Honest, and always telling the truth. 

  • Accurately depicting what is real. 

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