confound

Verb

• mistake one thing for another
  • you are confusing me with the other candidate
    
  • I mistook her for the secretary
    

• be confusing or perplexing to; cause to be unable to think clearly
  • These questions confuse even the experts
    
  • This question completely threw me
    
  • This question befuddled even the teacher
    

Related words

• Synonyms: 
  confuse , throw , fox , befuddle , fuddle , bedevil , discombobulate