The Oxford Thesaurus An A-Z Dictionary of Synonyms - exasperatev.

1) anger, infuriate, enrage, incense, madden, rile, drive mad; embitter; inflame; Colloq drive crazy, drive up the wall: Dealing with a bureaucracy can be exasperating for anyone. 2) irritate, 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: The child's constant questions were beginning to exasperate me.