bonehead vs lost soul

bonehead

noun
  • Someone who is stubborn, thick-skulled, or stupid. 

lost soul

noun
  • One who is forlorn, who lacks direction, purpose, or motivation in life. 

  • A soul that is destined to go to hell; a person possessing such a soul. 

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