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undulating (adj) wavy/having a wavy shape, rising and falling.
A hilly area undulates. Because of the hills and the valleys, the land in the area has a wavy shape, full of ups and downs. An area of land full of ups and down is undulating.
- As we drove along the countryside, we enjoyed its undulating landscape. The ups and downs of that stretch of land looked beautiful.
- From here on the flat land ended making room for undulating hilly area. With the hills and valleys the area had the shape of waves, rising with hills, and falling with valleys.