'immobility' originates from Latin, specifically the word 'immobilitas', where 'im-' meant 'not' and 'mobilis' meant 'movable'.

'immobilitas' transformed into the Old French word 'immobilité', and eventually became the modern English word 'immobility'.

Initially, it meant 'not movable', but over time it evolved into its current meaning of 'the state of not moving or being unable to move'.