abjure vs unspeak

abjure

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

  • To abstain from; to avoid; to shun. 

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

unspeak

verb
  • To retract what one has spoken, to unsay. 

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