IPA: /ˈjʌmiər/
KK: /ˈjʌmɪər/
More delicious or tasty than something else.
This cake is yummier than the one we had yesterday.
Yummier → It is formed from "yum" (an informal expression of pleasure in food, likely imitative of the sound of enjoyment) and "-ier" (a comparative suffix meaning more). The word "yummier" means more delicious or more enjoyable in taste.
Think of the sound "yum" that expresses enjoyment of food, and remember that adding "-ier" means something is even more enjoyable to eat.