Synonyms of 'horror-struck'
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If you are aghast, you are filled with horror and surprise.
His colleagues were aghast at the sackings.
If you are appalled by something, you are shocked or disgusted because it is so bad or unpleasant.
We are all appalled that these items are still on sale.
Thesaurus for horror-struck from the Collins English Thesaurus
If you describe someone as horror-struck or horror-stricken , you mean that they feel very great horror at something that has happened .