Synonyms for frustrate

Verb

1. thwart, queer, spoil, scotch, foil, cross, frustrate, baffle, bilk, prevent, forestall, foreclose, preclude, forbid

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

2. torment, rag, bedevil, crucify, dun, frustrate, harass, hassle, harry, chivy, chivvy, chevy, chevvy, beset, plague, molest, provoke

usage: treat cruelly; "The children tormented the stuttering teacher"