'barless' originates from English, specifically formed from the noun 'bar' and the suffix '-less'. 'Bar' traces to Old French 'barre' and Late Latin 'barra', where 'barra' meant 'bar' or 'barrier', and the suffix '-less' comes from Old English 'lēas' meaning 'free from' or 'without'.

'bar' changed from Old French word 'barre' (from Late Latin 'barra') and eventually became the modern English word 'bar'; the suffix '-less' developed from Old English 'lēas' into the modern English suffix '-less', producing 'barless' by combination in English.

Initially, it meant 'without a physical bar or barrier', but over time it has retained that literal meaning and has also been used figuratively to mean 'not barred' or 'not prohibited'.