hell-bent vs persevering

hell-bent

adj

  • Recklessly determined to do or achieve (something). 

adv

  • In a recklessly determined manner; determinedly, wholeheartedly. 

persevering

adj

  • Tending to persevere. 

noun

  • perseverance 

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