v.
confuse, bewilder, puzzle, mystify, distract, baffle, befuddle, confound, muddle, disconcert, stump, nonplus, stymie, stupefy, stun, daze, dumbfound or dumfound, flabbergast, Colloq bamboozle, hornswoggle, Chiefly US and Canadian discombobulate, throw for a loop:
The more I tried to understand bathymetric semiotics, the more perplexed I became. Anne-Marie's reticence perplexed us all.