'uncontained' originates from the prefix 'un-' meaning 'not' and the word 'contain' from Latin 'continere', where 'con-' meant 'together' and 'tenere' meant 'to hold'.

'continere' transformed into the Old French word 'contenir', and eventually became the modern English word 'contain'.

Initially, 'contain' meant 'to hold together', but over time 'uncontained' evolved to mean 'not held together or restrained'.