IPA: /ˌʌnəˈpiːlɪŋli/
KK: /ʌnəˈpilɪŋli/
In a way that is not attractive or pleasing.
The dish was presented unappealingly, making it hard to enjoy the meal.
Unappealingly → It is formed from "un-" (meaning not), "appealing" (from Latin "appellare", meaning to call or name), and "-ly" (meaning in a manner). The word "unappealingly" means in a manner that is not attractive or inviting.
Think of 'not' ('un-') making something 'attractive' ('appealing') — so when something is unappealingly done, it is done in a way that is not attractive.