The gracefulness of a person or animal that is flexible and supple

Usage examples of litheness.

Aunt Sibylla Cradlebow, the speaker, was tall and dark-eyed, with an almost superhuman litheness of body, and a weird, beautiful face.

Gorlot strode in, his square face as still as ever, his square frame devoid of the grace and litheness that characterized Harlan.

It was something else, it was the unctuous, verminous ease, the undulant litheness and fluidity of his every movement, seeming to hint at an inner structure and vertebration that were less than human—or, one might almost have said, a sub-ophidian lack of all bony frame-work—which made me view the captive, and also my incumbent task, with an unparallelable distaste.