'uncleanness' originates from Old English, specifically the word 'uncleannys,' where 'un-' meant 'not' and 'clean' meant 'free from dirt.'

'uncleannys' transformed into the Middle English word 'uncleannesse,' and eventually became the modern English word 'uncleanness.'

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