hangdog vs regretful

hangdog

adj
  • Low; sneaking; ashamed. 

noun
  • A base, degraded person. 

verb
  • To move or loiter in a sneaking or ashamed manner. 

regretful

adj
  • Full of feelings of regret, indulging in regrets. 

  • Sorrowful about what has been lost or done. 

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