'undecided' originates from Middle English, specifically the prefix 'un-' meaning 'not' and the word 'decide' from Latin 'decidere,' where 'de-' meant 'off' and 'caedere' meant 'to cut.'

'decidere' transformed into the Old French word 'decider,' and eventually became the modern English word 'decide,' with 'undecided' forming as a negation.

Initially, it meant 'not having cut off or resolved,' but over time it evolved into its current meaning of 'not having made a decision.'