popular vs unwritten

popular

adj
  • Pertaining to or deriving from the people or general public. 

  • Liked by many people; generally pleasing, widely admired. 

  • Common among the general public; generally accepted. 

  • Adapted to the means of the common people; cheap. 

  • Concerning the people; public. 

  • Aimed at ordinary people, as opposed to specialists etc.; intended for general consumption. 

noun
  • A person who is popular, especially at a school. 

  • An inexpensive newspaper with wide circulation. 

  • A member of the Populares 

unwritten

adj
  • Implicit or understood but not formally articulated. 

  • Not written. 

  • Oral or otherwise communicated without writing. 

  • Containing no writing; blank. 

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