disinterest vs steadfastness

disinterest

verb

  • To render disinterested. 

noun

  • The absence of interest (bias or stake). 

  • An absence of interest (attention or curiosity). 

steadfastness

noun

  • Loyalty in the face of trouble and difficulty. 

  • Steadfast resolution. 

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