'unrestricted' originates from the prefix 'un-' meaning 'not' and the word 'restricted' from Latin 'restrictus', meaning 'bound tightly'.

'restrictus' transformed into the Old French word 'restricter', and eventually became the modern English word 'restrict', with 'un-' added to form 'unrestricted'.

Initially, it meant 'not bound tightly', but over time it evolved into its current meaning of 'not limited or controlled'.