'Delcardes pouted a little, made a face at Tu who scowled back, then smiled sunnily and turned on her couch with a lissome movement.'

-The Cat and the Skull

lis·some

[ˈlisəm]

ADJECTIVE

lissom (adjective)

1. (of a person or their body) thin, supple, and graceful.

synonyms: agile · graceful · supple · limber · lithesome · loose-limbed · nimble · deft · flexible · lissome · slender · slim · willowy

antonyms: clumsy

ORIGIN

late 18th cent.: contraction, from lithe + -some.

Literary Impressions of the Prose and Verse of Robert E. Howard

https://www.amazon.com/Well-Heroes-Literary-Impressions-Robert/dp/1546353844/ref=sr_1_1/139-6536987-6675238?s=books&ie=UTF8&qid=1493920079&sr=1-1