dumbfound
Verb
Meaning
be a mystery or bewildering to
Source: WordNetSynonyms
beat
stick
pose
puzzle
gravel
baffle
mystify
amaze
bewilder
perplex
stupefy
nonplus
flabbergast
flummox
strike dumb
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Examples
This beats me!
Got me--I don't know the answer!
a vexing problem
This question really stuck me