The Collaborative International Dictionary
Undulatingly
Undulating \Un"du*la`ting\, a. Rising and falling like waves; resembling wave form or motion; undulatory; rolling; wavy; as, an undulating medium; undulating ground. -- Un"du*la`ting*ly. adv.
Wiktionary
undulatingly
adv. In an undulate manner.
Usage examples of "undulatingly".
Below, in the clear air, the countryside stretched undulatingly and greenly away to the horizon.
For several days they glided undulatingly over the water, till finally they came to the horizon, where the sea meets the sky.