'unbonded' originates from the prefix 'un-' meaning 'not' and the word 'bond', which comes from Middle English 'bond', from Old English 'bonda', meaning 'a binding or connection'.

'bond' changed from the Old English word 'bonda' and eventually became the modern English word 'bond'.

Initially, 'bond' meant 'a binding or connection', and this meaning has largely remained the same in modern usage.