confused vs muddle-headed

confused

adj
  • chaotic, jumbled or muddled 

  • making no sense; illogical 

  • embarrassed 

  • unable to think clearly or understand 

  • disoriented 

muddle-headed

adj
  • Characterized by vague or confused thinking: foolish, dull-witted, semi-conscious. 

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