explicit vs plain-speaking

explicit

adj
  • Containing material (e.g. language or film footage) that might be deemed offensive or graphic. 

  • Very specific, clear, or detailed. 

noun
  • The final few words of a text. 

plain-speaking

adj
  • Synonym of plain-spoken 

How often have the words explicit and plain-speaking occurred in a corpus of books? (source: Google Ngram Viewer )