obliging vs renitent

obliging

noun

  • The imposition of an obligation. 

adj

  • Happy and ready to do favours for others. 

renitent

adj

  • resistant to compulsion; recalcitrant 

  • resistant to physical pressure; unyielding 

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