Jadīl denotes a slender cord, often made by twisting or plaiting thin strips of leather. The poet invokes the image not to suggest roughness but to convey the waist's narrow, finely shaped contour.
Mukhaṣṣar has the form of a passive participle and conveys being neatly or narrowly waisted; its root is kh-ṣ-r (خ ص ر). Laṭīf contributes delicacy and fineness.
The initial wa- of wa-kashḥin continues a sequence of coordinated descriptions launched earlier by farʿin. This continuity is a grammatical clue that the poet is building one extended portrait, not changing to an unrelated scene.