'nonmobile' originates from English, formed by combining the prefix 'non-' (meaning 'not') with 'mobile', where 'mobile' ultimately comes from Latin 'mobilis' meaning 'movable'.

'mobile' changed from Latin 'mobilis' into Old French/Middle English forms (e.g. Old French movable/mobile) and eventually became the modern English word 'mobile'; 'nonmobile' is a later English formation using the prefix 'non-'.

Initially, 'mobile' in Latin meant 'movable' and retained that core meaning in English; 'nonmobile' was formed to express the opposite ('not movable'), a straightforward negation of the original sense.