'immodesty' originates from Latin, specifically the word 'immodestia,' where 'im-' meant 'not' and 'modestia' meant 'moderation or modesty.'

'immodestia' transformed into the Old French word 'immodestie,' and eventually became the modern English word 'immodesty' through Middle English.

Initially, it meant 'lack of moderation or restraint,' but over time it evolved into its current meaning of 'lack of modesty or decency.'