supple

(verb) make pliant and flexible. Example: "These boots are not yet suppled by frequent use."

(adj) moving and bending with ease. Synonyms: lissome, lissom, lithe, lithesome, slender, svelte, sylphlike.

(adj) (used of e.g. personality traits) readily adaptable. Synonyms: limber. Examples: "A supple mind." "A limber imagination."

(adj) (used of persons' bodies) capable of moving or bending freely. Synonyms: limber.