evenhanded vs nonpartisan

evenhanded

adj
  • fair and having no partiality; unbiased; just. 

nonpartisan

adj
  • Not partisan; impartial and unbiased 

noun
  • A person who has not selected or declared a side or party. 

  • One who is not a partisan. 

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