downright vs plain-speaking

downright

adj
  • Using plain direct language; accustomed to express opinions directly and bluntly; blunt. 

  • Directly to the point; plain 

  • Complete; absolute 

adv
  • Really; actually; quite 

plain-speaking

adj
  • Synonym of plain-spoken 

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