Open English Wordnet
Verbs
(v)roll, undulateoccur in soft rounded shapes“The hills rolled past” (v)roll, undulate, flap, wavemove in a wavy pattern or with a rising and falling motion“The curtains undulated”,
“the waves rolled towards the beach” (v)undulateincrease and decrease in volume or pitch, as if in waves“The singer's voice undulated” Adjectives
(s)undulatehaving a wavy margin and rippled surface