filled with horror and surprise when you see or hear something 惊恐；惊骇 Erica looked at him aghast. 埃里卡惊恐地望着他。 🔊🔊 - aghast at something
He stood aghast at the sight of so much blood. 他看见这么多血，吓得目瞪口呆。 🔊🔊
Word Originlate Middle English: past participle of the obsolete verb agast, gast ‘frighten’, from Old English gǣsten. The spelling with gh (originally Scots) became general by about 1700, probably influenced by ghost; compare with ghastly.