'unproven' originates from the prefix 'un-' meaning 'not' and the word 'proven,' which is the past participle of 'prove.'

'proven' changed from the Old English word 'prōfian' and eventually became the modern English word 'prove.'

Initially, it meant 'to test or try,' but over time it evolved into its current meaning of 'to establish the truth or validity of something.'