exasperate

[1]	anger , exacerbate , aggravate , infuriate , enrage , incense , madden , rile , drive mad , embitter , inflame , (Colloq) drive crazy , drive up the wall
[2]	irritate , infuriate , incense , irk , annoy , bother , harass , pique , gall , nettle , rankle , provoke , vex , pester , torment , plague , hector , badger , (Colloq) bug , needle , peeve , get , get under (someone's) skin , rub (up) the wrong way , aggravate , (Slang) get (someone's) goat , piss (someone) off
[3]	worsen , aggravate , exacerbate