free-thinking vs sinful

free-thinking

adj
  • Having opinions that are contrary to dogma or the positions of authority. 

sinful

adj
  • Constituting a sin; morally or religiously wrong; wicked; evil 

  • Having sinned; guilty of sin. 

  • decadent (luxuriously self-indulgent) 

How often have the words free-thinking and sinful occurred in a corpus of books? (source: Google Ngram Viewer )