'indignant' originates from Latin, specifically the word 'indignari,' where 'in-' meant 'not' and 'dignus' meant 'worthy.'

'indignari' transformed into the French word 'indigner,' and eventually became the modern English word 'indignant' through Middle English.

Initially, it meant 'unworthy or disgraceful,' but over time it evolved into its current meaning of 'feeling anger at unfair treatment.'