aghast (adjective)

1. The aghast look on her face told me she had just witnessed something truly terrifying.

2. Their aghast expressions reflected their disbelief in the miracle they had just witnessed at the church.

3. He fell to one knee, aghast, when he saw her radiant smile as she said 'yes' to his marriage proposal.

4. The audience was aghast as they watched the horrifying scene unfold on the big screen.