"frustrating" 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
treat cruelly
"The children tormented the stuttering teacher"
"frustrating" in the adjective sense
1. frustrating
discouraging by hindering
2. frustrating, frustrative, thwarting
preventing realization or attainment of a desire
Source: WordNet® (An amazing lexical database of English)
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