aggravate, anger, annoy, bug, chafe, chivy (or chivvy), exasperate, fret, gall, get, grate, harass, harry, irk, irritate, nettle, peeve, pester, pique, put off, put out, rile, vex

bedevil, haunt, plague

abash, confound, confuse, discomfit, disconcert, discountenance, embarrass, faze, fluster, jar, mortify, nonplus, rattle, shake up

daunt, demoralize, discourage, dishearten, dispirit, unnerve