blarney vs persuasiveness

blarney

noun
  • Persuasive flattery or kind speech; smooth, wheedling talk. 

  • Ability to talk constantly and fluently. 

  • Mindless chatter. 

verb
  • To beguile with flattery. 

persuasiveness

noun
  • The capability of a person or argument to convince or persuade someone to accept a desired way of thinking. 

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