nonplus
v : be a mystery or bewildering to; "This beats me!"; "Got me--I
don't know the answer!"; "a vexing problem"; "This
question really stuck me" [syn: perplex, vex, stick,
get, puzzle, mystify, baffle, beat, pose, bewilder,
flummox, stupefy, gravel, amaze, dumbfound]
[also: nonplussing, nonplusses, nonplussed]