What does undulate mean?
Undulate- to move in waves or in a way manner (VB)
Since undulate is a verb, you can't give an adjective for it. However, you could describe it with an adverb. Here are a few adverbs that would describe the word undulate: gracefully elegantly smoothly easily These are not all of the adverbs that describe this word. If you want more, look up any of these in a thesaurus.