'improvable' originates from the Latin word 'improbare,' where 'im-' meant 'not' and 'probare' meant 'to test or prove.'

'improbare' transformed into the Old French word 'improver,' and eventually became the modern English word 'improve' with the suffix '-able' added to form 'improvable.'

Initially, it meant 'capable of being tested or proven,' but over time it evolved into its current meaning of 'capable of being improved or enhanced.'