jolt, shake, rattle, agitate, paralyze, startle, sicken, panic, threaten, transfix, shock, unnerve, alarm, intimidate, scare, terrify, horrify, daunt, disgust, frighten, distress, petrify, revolt, nauseate, make one's skin crawl, spook, appall, strike fear into, make one's hair stand on end, send chills down one's spine, scare the bejesus out of, scare the pants off of, make one's blood run cold, frighten someone out of their wits, scare the shit out of, scare shitless
struggle, suffocate, jerk, fidget, fuss, tense up, stiffen, wring (one's hands), smolder, quaver, pace, speculate, lose focus, fixate, concoct, trip up, lose control, micromanage, obsess, ratchet up, pump up, fear, dread, replay, work up, fret, lose sleep, weigh one down, distrust, warn, caution, agonize, play with (one's hair), jitter, catastrophize
assault, stab, sicken, curse, slur, swear, insult, humiliate, disgust, nauseate, turn off, outrage, wound, antagonize, rub the wrong way, offend, gross out, tread on someone's toes, affront, hurt someone's feelings, add insult to injury, spit daggers, rub salt in a wound, blaspheme, cuss, ruffle someone's feathers
jar, gnaw, jolt, bother, rattle, agitate, startle, blot out, pique, muddle, baffle, vex, trouble, trip up, disturb, boggle, astonish, dumbfound, unnerve, upset, rankle, jostle, inflame, horrify, alienate, appall, gall, aggravate, exasperate, disconcert, discomfit, mortify, irritate, drive to distraction, get someone's goat, peeve, try someone's patience, rub the wrong way, miff, jangle, make someone's blood boil, evoke (a strong reaction), get someone's dander up, ruffle someone's feathers, make someone's hackles rise, discomfort
complicate, rattle, stun, scramble, imply, obscure, riddle, blur, blind, muddy, distract, cloud, hoodwink, fake, mislead, obfuscate, muddle, baffle, fool, vex, confuse, confound, stupefy, befuddle, bamboozle, bewilder, mystify, nonplus, disorient, blunt (someone's judgment/perception), addle, stump, hide (evidence), fog, miscue, perplex, puzzle, boggle, jumble, misconstrue, discombobulate, contradict oneself, fluster, throw off-kilter
jolt, stun, startle, surprise, trick, baffle, stupefy, befuddle, bamboozle, bewilder, stagger, mystify, nonplus, disorient, overwhelm, stump, perplex, discombobulate, shock, take by surprise, astonish, dumbfound, flummox, astound, unnerve, flabbergast, daze, faze, floor, amaze, alarm, upset, catch off guard, ambush, test (one's assumption), undermine, throw for a loop, throw off-kilter