'remiss' originates from Latin, specifically the word 'remissus,' where 're-' meant 'back' and 'mittere' meant 'to send.'

'remissus' transformed into the Old French word 'remis,' and eventually became the modern English word 'remiss' through Middle English.

Initially, it meant 'to send back or let go,' but over time it evolved into its current meaning of 'negligent or careless.'