It undulated slightly, as though the station corridor were filled with deep ocean swells and not stale, unmoving air.

It wasn't flat-- the surface undulated slightly along an oblique angle.

Its shape undulates just slightly, swelling in the center front.

The margins of the leaves are flat to slightly undulate with a distinct midrib.

The great globular mass of protoplasmic slush undulated slightly, as if aware of him.

The tunnel undulated slightly in the deep currents, rivers of bitterly cold water swirling along the floor of the straits.

Its outer margin may undulate slightly.

The surface of the island undulates slightly, and consists of a lava plateau.

The ground undulated slightly but they had no trouble negotiating the gentle rises and easy downslopes.

Because the land undulates slightly, the poles vary in height: the shortest is 15 feet and the longest is 26 feet 9 inches.