Aghast (adjective)

1. Feeling shock and horror, as if struck with amazement.
2. Filled with fear or shock.

Origin:

Middle english: from old english ongeæst, past participle of un- + gæstan "frighten".

Examples:

1. She was aghast at the news of the accident.
2. He was aghast at the thought of losing his job.
3. The crowd was aghast at the sight of the burning building.
4. The students were aghast at the teacher's announcement.
5. She was aghast at the destruction caused by the storm.