ADJ（形容词） If you describe someone as horror-struck or horror-stricken, you mean that they feel very great horror at something that has happened. 惊恐万分的
"What is the matter with Signora Anna?" he whispered, horror-struck at her vacant face.
“安娜夫人怎么啦？”他惊恐万分地看着她那失神的脸小声问道。