rippling vs undulant

rippling

adj
  • Moving in a chaotic, undulating fashion, as in a flow of water or a flag blowing in the wind. 

noun
  • A motion or sound that ripples. 

undulant

adj
  • Having the characteristics of a wave; wavelike 

How often have the words rippling and undulant occurred in a corpus of books? (source: Google Ngram Viewer )