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Use "undulous" in a sentence
"He leaned almost on the neck of the mare, which, as I knew, must close the wound; and the light of his eyes was quite different, and the pain of his forehead unstrung itself, as if he felt the undulous readiness of her volatile paces under him."
"For marvellous was the ease and beauty with which these ships went through their nautical movements; now as in chase of each other, now approaching as in conflict, veering off, darting aside, threading as it were a harmonious maze, gliding in and out, here, there, with the undulous celerity of the serpent."
"A long, dark, undulous furrow came moving along the waters, nearer and nearer, till the vast head of the reptile emerged -- its jaws bristling with fangs, and its dull eyes fixing themselves hungrily on the spot where I sat motionless."