confused vs mumbling

confused

adj
  • making no sense; illogical 

  • chaotic, jumbled or muddled 

  • embarrassed 

  • unable to think clearly or understand 

  • disoriented 

mumbling

noun
  • An act in which someone mumbles something 

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