in horror
With great displeasure, fear, and/or surprise. Mom reacted in horror when she saw that I'd dyed my hair hot pink the night before school picture day. My bridesmaids looked at me in horror when they saw the dresses I'd picked out for them—as a joke.
in horror
with intense shock or disgust. Mike stepped back from the rattlesnake in horror. The jogger recoiled in horror when she came upon a body in the park.