good faith vs sincereness

good faith

noun
  • Good, honest intentions, even if producing unfortunate results. 

adj
  • Having or done with good, honest intentions; well-intentioned. 

  • Presuming that all parties to a discussion are honest and intend to act in a fair and appropriate manner. 

sincereness

noun
  • sincerity 

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