'undesired' originates from Middle English, specifically the word 'desiren,' where 'desire' meant 'to wish or long for.' The prefix 'un-' negates the meaning.

'desiren' transformed into the modern English word 'desire,' and with the addition of the prefix 'un-,' it became 'undesired.'

Initially, it meant 'not wished for,' and this meaning has largely remained the same in modern usage.