'defeatable' originates from the Latin word 'deficere,' where 'de-' meant 'away' and 'facere' meant 'to do or make.'

'deficere' transformed into the Old French word 'defait,' and eventually became the modern English word 'defeat,' from which 'defeatable' is derived.

Initially, it meant 'to undo or destroy,' but over time it evolved into its current meaning of 'capable of being defeated.'