vex, plague, perplex, afflict, confound, haunt, mystify, abound, pervade, loom, frustrate, dominate, irk, persist, befuddle, fascinate, beset, lurk, stymie, baffle, preoccupy, exasperate, unravel, bewilder, linger, overwhelm, dogged, beleaguering, permeate, flummox, threaten, fester, roil, transfix, outlast, infest, overshadow, nagging, grapple, pummel, predominate, solve, ravage, vanquish, creep, implode, riddled, underwhelm, bemuse, rankle, embroil, daunt, elude, ensnare, engulf, befall, unnerve, falter, torment, beckon, rattle, proliferate, entangle, portend, dooms, typify, muddle, mired, arise, astonish, vanish, enmesh, upend, crumble, complicate, sidestep, discomfit, irritate, gnaw, devour, beget, derail, paralyze, maddening, fluster, erupt, exorcize, confronting, galore, confuse, imperil, emerge, hamper, wrack, boggle, ensue, burgeon, wreak, deflate, infuriate, ramify, suffuse

amaze, badger, baffle, beat, beleaguer, bewilder, bug, disorient, disorientate, dumbfound, flummox, get, gravel, hamstring, harass, madden, mystify, nonplus, oppress, perplex, persecute, pester, puzzle, stupefy, stupify, tease, trounce

annoy, be, bother, devil, get at, get to, gravel, irritate, nark, nettle, rag, rile, vex

befuddle, confound, confuse, crucify, discombobulate, dun, fox, frustrate, fuddle, rag, tantalize, throw, torment