'inadmissibly' originates from the Latin word 'admissibilis,' where 'ad-' meant 'toward' and 'missibilis' meant 'able to be sent.'

'admissibilis' transformed into the French word 'admissible,' and eventually became the modern English word 'admissible,' with 'inadmissible' forming as its negative counterpart.

Initially, it meant 'able to be sent or allowed,' but over time it evolved into its current meaning of 'not allowed or accepted.'