Simple past tense and past participle of horrify.(verb)
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Use "horrified" in a sentence
"Her expression horrified, she clasped her hand over her mouth and abruptly stood up."
"Eranikus stared off into space, his expression horrified."
"Now Merry withdrew her hand, her expression horrified, betrayed; it would have been less shocking, he thought, to tell her his dead mother was in the room with them."