'untune' originates from Middle English, specifically the prefix 'un-' meaning 'not' and the word 'tune,' which meant 'to bring into harmony.'

'tune' changed from the Old English word 'tune' and eventually became the modern English word 'tune.' The prefix 'un-' was added to form 'untune.'

Initially, it meant 'to bring out of harmony,' and this meaning has largely remained the same in modern usage.