"frustrate" in the verb sense
1. thwart, queer, spoil, scotch, foil, cross, frustrate, 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"
2. torment, rag, bedevil, crucify, dun, frustrate
"The children tormented the stuttering teacher"
Source: WordNet® (An amazing lexical database of English)
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