Question

ap·pall
  (US)   ( or Brit   ap·pal) /əˈpɑːl/  verb  , -palls, -palled, -pall·ing [  + obj  ]
  : to cause (someone) to feel fear, shock, or disgust
   The thought of war appalls me.
   It appalls me to think of the way those children have been treated.
  — often used as (be) appalled
   We were appalled at how long it took for our food to be served. = We were appalled that it took so long.
   She was appalled by/at their behavior.