medieval vs swaybacked

medieval

adj

  • Archaic. 

  • Of or relating to the Middle Ages, the period from approximately 500 to 1500 AD. 

  • Brutal. 

noun

  • Someone living in the Middle Ages. 

  • A medieval example (of something aforementioned or understood from context). 

swaybacked

adj

  • Old. 

  • Having sagged or hollow surface. 

  • Having a sagged back. 

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