"thwarting" in the noun sense
1. frustration, thwarting, foiling
an act of hindering someone's plans or efforts
"thwarting" 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"
"thwarting" in the adjective sense
1. frustrating, frustrative, thwarting
preventing realization or attainment of a desire
Source: WordNet® (An amazing lexical database of English)
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