'unnecessarily' originates from the Latin word 'necessarius,' where 'ne-' meant 'not' and 'cessarius' meant 'yielding or giving way.'

'necessarius' transformed into the Old French word 'necessaire,' and eventually became the modern English word 'necessary,' with 'un-' added as a prefix to form 'unnecessary.'

Initially, it meant 'not yielding or giving way,' but over time it evolved into its current meaning of 'not needed or required.'