Tā jīnghài de zhēng dà le yǎnjīng, shuō bù chū huà lái.
Her eyes went wide with horror; she couldn't speak.
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惊骇 is more literary and stronger than 吃惊 (chījīng, 'surprised') or 害怕 (hàipà, 'afraid'). It implies a combination of shock and horror — pick it for written narrative or formal speech, not casual conversation.
