perplex

Verb

• make more complicated
  • There was a new development that complicated the matter
    

• be a mystery or bewildering to
  • This beats me!
    
  • Got me--I don't know the answer!
    
  • a vexing problem
    
  • This question really stuck me
    

Related words

• Synonyms: 
  complicate , vex , stick , get , puzzle , mystify , baffle , beat , pose , bewilder