hidebound vs undaring

hidebound

adj
  • Stubborn; narrow-minded; inflexible. 

  • Having the bark so close and constricting that it impedes the growth. 

  • Bound with the hide of an animal. 

  • Having the skin adhering so closely to the ribs and back as not to be easily loosened or raised; emaciated. 

undaring

adj
  • not daring; unadventurous 

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