to make (plans, efforts, etc.) worthless or of no avail; defeat; nullify

The student's indifference frustrated the teacher's efforts to help him.

to disappoint or thwart (a person)

a talented woman whom life had frustrated.

to become frustrated

His trouble is that he frustrates much too easily.

frustrated.

verb

aid , assist , cooperate , encourage , facilitate , help , support

verb

annul , arrest , baffle , balk , bar , beat , block , cancel , check , circumvent , confront , conquer , counter , counteract , cramp , cramp one’s style , crimp , dash , dash one’s hope , defeat , depress , discourage , dishearten , foil , forbid , forestall , foul up * , give the run around , halt , hang up * , hinder , hold up , impede , inhibit , lick , negate , neutralize , nullify , obstruct , obviate , outwit , overcome , preclude , prevent , prohibit , render null and void , ruin , stump * , stymie * , upset the applecart * , checkmate , stymie , thwart , as is , blight , confound , countermand , cross , crush , disappoint , discomfit , disconcert , elude , exasperate , fluster , stultify , tantalize , torment , unsettle , useless , vain , void