'undisputed' originates from the prefix 'un-' meaning 'not' and the word 'disputed' from Latin 'disputare', where 'dis-' meant 'apart' and 'putare' meant 'to think'.

'disputare' transformed into the Old French word 'disputer', and eventually became the modern English word 'dispute', with 'undisputed' forming by adding the prefix 'un-'.

Initially, 'dispute' meant 'to think apart', but over time 'undisputed' evolved to mean 'not challenged or questioned'.