austere vs classy

austere

adj
  • Lacking decoration; trivial; not extravagant or gaudy 

  • Grim or severe in manner or appearance 

classy

adj
  • Elegant, highly stylish or fashionable. 

  • Of a superior type; especially, exhibiting admirable personal qualities. 

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