'unadapted' originates from the prefix 'un-' meaning 'not' and the word 'adapted', which comes from Latin 'adaptare', meaning 'to fit to'.

'adaptare' transformed into the Old French word 'adapter', and eventually became the modern English word 'adapt'. The prefix 'un-' was added to form 'unadapted'.

Initially, 'adapt' meant 'to fit or adjust', and 'unadapted' has consistently meant 'not adjusted'.