diametrical vs downright

diametrical

adj
  • Of or pertaining to a diagonal or diameter 

  • Completely opposed 

downright

adj
  • Directly to the point; plain 

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

  • Complete; absolute 

adv
  • Really; actually; quite 

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