perplex
     v 1: 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: {vex}, {stick}, {get}, {puzzle},
           {mystify}, {baffle}, {beat}, {pose}, {bewilder}, {flummox},
           {stupefy}, {nonplus}, {gravel}, {amaze}, {dumbfound}]
     2: make more complicated; "There was a new development that
        complicated the matter" [syn: {complicate}] [ant: {simplify}]
Source: WordNet® 2.0