chill, daunt, demoralize, discourage, dishearten, dismay, frustrate, unman, unnerve

browbeat, bully, cow, intimidatedepress, sadden, weighafflict, trydamp, dampen, deadendistress, troublebother, irk, vex, worrydebilitate, enfeeble, undermine, weakenfrighten, horrify, scare

throw cold water on

embolden, encourage, hearten, nerve, steel

buoy (up), cheer, gladdenanimate, enliven, invigorateenforce, fortify, reinforce(also reenforce), strengthenassure, reassureboost, energize, excite, galvanize, inspire, lift, provoke, quicken, rally, stimulate, stir