Main entry: perplex, complicate
Definition: make more complicated
Usage: There was a new development that complicated the matter
Main entry: dumbfound, bewilder, baffle, beat, amaze, puzzle, pose, mystify, nonplus, perplex, stick, stupefy, flummox, gravel, get, vex
Definition: be a mystery or bewildering to
Usage: This beats me!; Got me--I don't know the answer!; a vexing problem; This question really stuck me