Definitions

1. adjective

having hills; having a surface that is uneven and hilly

“The hilly terrain made it difficult to build a house in that area.”

2. adverb

in a hilly manner or with hills

“The hilly route was not suitable for beginners, so they decided to take the easy way down.”

3. noun

a region or area of hilly country

“The hilly part of the state was known for its scenic beauty and outdoor recreation opportunities.”