IPA: /əˈpæl/
KK: /əˈpæl/
To cause someone to feel shock or dismay; to horrify.
The news of the disaster appalled the entire community.
Past: appalled
Past Participle: appalled
Appal originates from Old English 'apellan', meaning to make pale or to frighten. The word conveys the sense of causing someone to become pale with fear or shock.
Think of something that makes you so scared that you turn pale — that's why appal means to frighten or shock.