Mountainous (adjective)

Having many mountains; hilly or mountainous.

Origin:

Late 16th century: from mountain + -ous.

Examples:

1. The mountainous terrain made it difficult to navigate.
2. The mountainous region is known for its beautiful scenery.
3. The road through the mountainous area was winding and narrow.
4. The mountainous country is rich in minerals and natural resources.
5. The hike was challenging due to the mountainous terrain.