[v] disturb the composure of
enervate, unnerve, unsettle
abash, annoy, appall, awe, bother, confound, confuse, daunt, deter, discomfit, disconcert, discountenance, discourage, dishearten, dismay, dumbfound, horrify, irritate, muddle, mystify, nonplus, overawe, perplex, puzzle, rattle, shake, stop, vex