undulant

"Now," he said, when he was stretched out on the undulant moss.

Beyond was a lake, very blue in the sunlight, bulwarked by undulant hills.

We are rocked together, you and I, To this undulant movement.

The air came brisk and sweet; it rippled the fields to undulant shimmer of flashing purple and green and gold.

Against the blue background of the sky, green hill-tops trace an undulant line.