retrogressive vs unprogressive

retrogressive

adj
  • Directed towards the rear or the past; retrograde. 

  • Of or relating to retrogression. 

noun
  • A person of retrogressive views or policies; a backward-looking conservative. 

unprogressive

adj
  • Not progressive; not contributing to progress. 

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