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Adjective: horror-struck  hor-ur strúk or hór-ur strúk [N. Amer], hó-rur strúk [Brit]
  1. Stricken with horror
    "They suggested that authors are not so much awe-struck or horror-struck as they are provoked by some topical issue";
    - horrified, horror-stricken

See also: afraid, 'fraid [non-standard]