'unjointed' originates from the prefix 'un-' meaning 'not' and the word 'jointed', which comes from the Old French 'joint', meaning 'joined'.

'joint' changed from the Old French word 'joint' and eventually became the modern English word 'jointed'.

Initially, it meant 'joined or connected', but with the prefix 'un-', it evolved into its current meaning of 'not having joints'.