undulate
1. [ verb ] stir up (water) so as to form ripples
Synonyms: ripple ruffle cockle riffle
Related terms: flow ripple fold
2. [ adjective ] (botany) having a sinuate margin and rippled surface
Related terms: smooth
3. [ verb ] occur in soft rounded shapes
Synonyms: roll
Examples:

"The hills rolled past"

Related terms: coil
4. [ verb ] increase and decrease in volume or pitch, as if in waves
Examples:

"The singer's voice undulated"

Related terms: change
5. [ verb ] move in a wavy pattern or with a rising and falling motion
Synonyms: wave flap roll
Examples:

"The curtains undulated" "the waves rolled towards the beach"

Related terms: move luff wave wave roller undulation
Similar spelling:   unmodulated
  unmutilated
  undulation
  unduly