agitate, ail, alarm(also alarum), bother, concern, derail, discompose, dismay, disquiet, distemper, distract, distress, disturb, exercise, flurry, frazzle, freak (out), fuss, hagride, perturb, undo, unhinge, unsettle, upset, weird out, worry

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, vexbedevil, haunt, plagueabash, confound, confuse, discomfit, disconcert, discountenance, embarrass, faze, fluster, jar, mortify, nonplus, rattle, shake updaunt, demoralize, discourage, dishearten, dispirit, unnerve