confused vs flustering

confused

adj
  • embarrassed 

  • making no sense; illogical 

  • chaotic, jumbled or muddled 

  • unable to think clearly or understand 

  • disoriented 

flustering

adj
  • agitated, confusing 

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