1) Abash 2) Addle 3) Befuddle 4) Bemuse 5) Bewilder 6) Confound 7) Disorient 8) Disorientate 9) Dumbfound 10) Faze 11) Flummox 12) Fluster 13) Mystify 14) Nonplus 15) Perplex 16) Throwintoatizzy 17) Undo 18) Unnerve 19) Upset 1) Be confusing or perplexing to 2) Bemuse 3) Bewilder 4) Discomfit 5) Discompose 6) Disconcert 7) Throw 8) To befuddle or perplex 9) To confuse or disconcert 10) Untune 11) Upset 
to disconcert; to upset
discombobulate, discombobulating, discombobulated, discombobulation 1. To throw into a state of confusion. 2. To confuse or to disconcert; to upset; to frustrate: 'The politician was completely discombobulated by the critics in the audience.' 3. Etymology: from 1834, American English, a fanciful coinage of a type popular then (originally discombo...
to confuse or disconcert; upset; frustrate: The speaker was completely discombobulated by the hecklers.