'unaffected' originates from the prefix 'un-' meaning 'not' and the word 'affected' from Latin 'affectare,' meaning 'to strive after.'

'affectare' transformed into the Old French word 'affecter,' and eventually became the modern English word 'affect' through Middle English.

Initially, it meant 'not influenced or changed,' and this meaning has largely remained the same in modern usage.