Synonyms for frustrate

verb

to frustrate means to deprive of effect or render worthless an effort directed to some end; thwart and balk both mean to frustrate by blocking someone or something moving toward some objective; foil means to throw off course so as to discourage further effort or make it of no avail our plans were foiled by bad weather; to baffle is to defeat the efforts of by bewildering or confusing the crime baffled the police