Both Uses

supple
in
Song of Myself
(Auto-generated)

The smoke of my own breath,
Echoes, ripples, buzz'd whispers, love-root, silk-thread, crotch and vine,
My respiration and inspiration, the beating of my heart, the passing
of blood and air through my lungs,
The sniff of green leaves and dry leaves, and of the shore and
dark-color'd sea-rocks, and of hay in the barn,
The sound of the belch'd words of my voice loos'd to the eddies of
the wind,
A few light kisses, a few embraces, a reaching around of arms,
The play of shine and shade on the trees as the supple boughs wag,
The delight alone or in the rush of the streets, or along the fields
and hill-sides,
The feeling of health, the full-noon trill, the song of me rising†
A gigantic beauty of a stallion, fresh and responsive to my caresses,
Head high in the forehead, wide between the ears,
Limbs glossy and supple, tail dusting the ground,
Eyes full of sparkling wickedness, ears finely cut, flexibly moving.†
*

Definitions:

(1) (supple)
moving and bending easily -- sometimes used figuratively to indicate mental flexibility when adapting to different conditions
(2) (meaning too rare to warrant focus)
More rarely, supple can be used metaphorically to describe someone who easily adapts to different situations.