frustrate


frustrate (http://definr.com/frustrate)

     v 1: hinder or prevent (the efforts, plans, or desires) of; "What
          ultimately frustrated every challenger was Ruth's
          amazing September surge"; "foil your opponent" [syn: thwart,
           queer, spoil, scotch, foil, cross, baffle,
          bilk]
     2: annoy constantly [syn: torment, rag, bedevil, crucify,
         dun]
     3: hinder or prevent (the efforts, plans, or desires) of [syn:
        spoil, thwart]