undulating
v. B2 Upper Intermediate US //ˈəndʒəˌɫeɪtɪŋ// UK //ˈʌndjʊlˌeɪtɪŋ// un·du·lat·ing
v. moving in a smooth, wave-like pattern. You use this to describe things like hills, waves, or even a person's voice.
v. moving or appearing in a series of gentle, regular waves or curves. Often describes physical landscapes or the rhythmic quality of sound.
The hills have an undulating shape.
The undulating waves of the ocean crashed against the shore as the storm passed.
The speaker's voice took on an undulating quality as she reached the climax of the speech, drawing the audience into a shared emotional experience.