abjure vs refrain

abjure

verb
  • To abstain from; to avoid; to shun. 

  • To reject with solemnity; to abandon forever; to repudiate; to disclaim. 

  • To renounce upon oath; to forswear; to disavow. 

refrain

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

noun
  • The chorus or burden of a song repeated at the end of each verse or stanza. 

  • A much repeated comment, complaint, or saying. 

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