Did You Know?
"Thwart" and its synonyms "foil" and "frustrate" all suggest checking or defeating another's plan or preventing the achievement of a goal. "Foil" implies checking or defeating so as to discourage future efforts ("foiled by her parents, he stopped trying to see her"), while "frustrate" suggests making all efforts, however vigorous or persistent, futile or ineffectual ("frustrated attempts at government reform"). "Thwart" usually indicates frustration caused by opposition ("the army thwarted an attempted coup").
*Indicates the sense illustrated in the example sentence.