IPA: /dɪsˈmeɪ.ɪŋ.li/
KK: /dɪsˈmeɪɪŋli/
In a way that makes someone feel worried, disappointed, or unhappy.
The results of the experiment were dismayingly poor, leading to concerns about the project's future.
Dismayingly → It is formed from "dis-" (meaning apart or away) and "may" (from Old English *mæg*, meaning to be able) combined with the adverbial suffix "-ingly" (indicating manner). The word describes an action done in a manner that causes a loss of ability or confidence, leading to distress or disappointment.
Think of 'dis-' meaning 'apart' and 'may' meaning 'to be able' — when something is done 'dismayingly', it causes a feeling of being unable or losing confidence.