definition of
frustrate

[1] #1 frustrate v. [thwart, queer, spoil, scotch, foil, cross, baffle, bilk] hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent". wn

[2] #2 frustrate v. [torment, rag, bedevil, crucify, dun] treat cruelly; "The children tormented the stuttering teacher". wn