'unfixed' originates from the prefix 'un-' meaning 'not' and the word 'fixed', which comes from Latin 'fixus', meaning 'fastened'.

'unfixed' changed from the Middle English word 'unfixen' and eventually became the modern English word 'unfixed'.

Initially, it meant 'not fastened or secured', but over time it evolved into its current meaning of 'not settled or subject to change'.