'indistinctly-defined' originates from the Latin word 'indistinctus,' where 'in-' meant 'not' and 'distinctus' meant 'separated or distinguished.'

'indistinctus' transformed into the Old French word 'indistinct,' and eventually became the modern English word 'indistinctly-defined.'

Initially, it meant 'not separated or distinguished,' but over time it evolved into its current meaning of 'not clearly defined.'