Having the form of waves, presenting a wavy outline or appearance, undulating, undulated. gen.

Perhaps: swelling like waves, wave-like. Obsolete.

figurative and in figurative context: characterized by rippling; flowing or moving in a rippling manner; proceeding in short rises and falls…

Forming an undulating line or a series of wave-like curves. Also, having an undulating margin.

Wavy, undulating.

Forming a series of wave-like curves.

Having an uneven or irregular surface; consisting of ups and downs.

Undulating in form or outline.

Of an undulating nature.