Open English Wordnet
Nouns
Verbs
(v)perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel, amaze, dumbfoundbe a mystery or bewildering to“This beats me!”,
“Got me — I don't know the answer!”,
“a vexing problem”,
“This question really stuck me” (v)thwart, queer, spoil, scotch, foil, cross, frustrate, baffle, bilkhinder or prevent (the efforts, plans, or desires) of“What ultimately frustrated every challenger was Ruth's amazing September surge”,
“foil your opponent”