Some good words to use instead are anxious, apprehensive, frightened, nervous, scared, shocked, suspicious, timid, abashed, aghast, alarmed, aroused, blanched, cowardly, cowed, daunted, discouraged, disheartened, dismayed, distressed, disturbed, faint-hearted, frozen, have cold feet, ,horrified, in awe, intimidated, panic-stricken, and worried.