irresolute vs weak-willed

irresolute

adj

  • Indecisive or lacking in resolution. 

  • Undecided or unsure how to act. 

weak-willed

adj

  • irresolute, indecisive 

  • easily swayed 

How often have the words irresolute and weak-willed occurred in a corpus of books? (source: Google Ngram Viewer )