'untreatably' originates from the English word 'untreatable,' where 'un-' is a prefix meaning 'not,' and 'treatable' comes from 'treat,' meaning 'to deal with or manage.'

'untreatable' evolved from the Middle English word 'tretable,' which meant 'manageable or negotiable,' and eventually became the modern English word 'untreatable' by adding the prefix 'un-.'

Initially, 'treatable' meant 'manageable or negotiable,' but with the prefix 'un-,' it evolved to mean 'not manageable or curable.'