definition of
appall

[1] #1 appall v. [shock, offend, scandalize, scandalise, appal, outrage] strike with disgust or revulsion; "The scandalous behavior of this married woman shocked her friends". wn

[2] #2 appall v. [dismay, alarm, appal, horrify] fill with apprehension or alarm; cause to be unpleasantly surprised; "I was horrified at the thought of being late for my interview"; "The news of the executions horrified us". wn