IPA: /əˈɡæst/
KK: /əˈgæst/
Feeling shocked or filled with fear and surprise, often because of something unexpected or frightening.
She was aghast at the news of the accident.
Comparative: more aghast
Superlative: most aghast
Aghast originates from the Old English 'āgæst', which means to frighten or terrify. The word conveys a sense of being struck with fear or shock.
Imagine being so frightened that you are 'struck' ('āgæst') with shock — that's what aghast means.