hell-bent vs tenacious

hell-bent

adj
  • Recklessly determined to do or achieve (something). 

adv
  • In a recklessly determined manner; determinedly, wholeheartedly. 

tenacious

adj
  • Unwilling to yield or give up; dogged. 

  • Having a good memory; retentive. 

  • Holding together; cohesive. 

  • Clinging to an object or surface; adhesive. 

How often have the words hell-bent and tenacious occurred in a corpus of books? (source: Google Ngram Viewer )