Meaning of “appalling” - Learner’s Dictionary

appalling

adjective uk us /əˈpɔːlɪŋ/
SHOCKING

shocking and very unpleasant:

Many live in appalling conditions.
appalling injuries
BAD

very bad:

appalling behaviour/weather
appallingly adverb

(Definition of “appalling” from the Cambridge Learner’s Dictionary © Cambridge University Press)