out of date vs retrogressive

out of date

prep
  • Not conforming to the current fashion or style; old-fashioned. 

  • Too old to be used; not current; invalid; outmoded. 

retrogressive

adj
  • Of or relating to retrogression. 

  • Directed towards the rear or the past; retrograde. 

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

How often have the words out of date and retrogressive occurred in a corpus of books?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