4 adjectives to describe undulating

The sun shone hot, the wind blew hard; and over the boundless undulating

Some deep-mouthed old forester will open his jaws, and send forth a volume of sound so deep, so loud, so changeful, so undulating and variable in its character, that, as it rolls along the forest, and comes back in quavering echoes from the mountains, you will almost swear that his single voice is an agglomerate of a thousand, all mixed, and mingled, and rolled up into one.

Some deep-mouthed old forester will open his jaws, and send forth a volume of sound so deep, so loud, so changeful, so undulating and variable in its character, that, as it rolls along the forest, and comes back in quavering echoes from the mountains, you will almost swear that his single voice is an agglomerate of a thousand, all mixed, and mingled, and rolled up into one.

Whenever there was any let-up the men promptly came forth from their houses and played head-ball with the utmost vigor; and we would listen to their shrill undulating cries of applause and triumph until we also grew interested and strolled over to look on.

4 adjectives to describe  undulating