affright, alarm(also alarum), fright, frighten, horrify, panic, scare, scarify, shock, spook, startle, terrorize

appall(also appal), bowl over, dismay, floor, jolt, shake, shake upamaze, astound, awechill, daunt, demoralize, dispirit, emasculate, psych (out), undo, unman, unnerve, unstringdiscomfort, discompose, disconcert, disquiet, distract, distress, disturb, perturb, unsettle, upset, worry

give one the creeps, make one's flesh creep(or make one's flesh crawl)

reassure

assure, cheer, comfort, console, solace, sootheembolden, encourage, hearten, inspire, steel