'limberness' is formed by adding the suffix '-ness' (of Old English origin) to the adjective 'limber'.

'limber' appears in Middle English as 'limber' meaning 'flexible'; the noun 'limberness' is a later formation using the productive English nominal suffix '-ness', yielding the modern word 'limberness'.

Initially described the state of being 'limber' (physically flexible); the core meaning has remained largely the same, though it is also used figuratively for mental or stylistic flexibility.