IPA: /ˈhɪli/
KK: /ˈhɪli/
This word describes a place that has a lot of hills or is characterized by hills.
The hilly landscape made it difficult to ride a bike.
Comparative: hillier
Superlative: hilliest
Hilly → The word is formed from "hill" (from Old English *hyll*, meaning a raised area of land) and the suffix "-y" (meaning characterized by). Thus, "hilly" describes an area characterized by hills.
Think of a landscape filled with "hills" — the suffix "-y" indicates that it is characterized by those hills.