frustrate

Verb

• treat cruelly
  • The children tormented the stuttering teacher
    

• hinder or prevent (the efforts, plans, or desires) of
  • What ultimately frustrated every challenger was Ruth's amazing September surge
    
  • foil your opponent
    

Related words

• Synonyms: 
  torment , rag , bedevil , crucify , dun , thwart , queer , spoil , scotch , foil , cross , baffle , bilk