'immutably-formed' originates from Latin, specifically the word 'immutabilis,' where 'im-' meant 'not' and 'mutabilis' meant 'changeable.'

'immutabilis' transformed into the English word 'immutable,' and eventually became the modern English term 'immutably-formed.'

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