'swiftly-changed' originates from the combination of 'swiftly,' meaning 'quickly,' and 'changed,' the past participle of 'change,' meaning 'to make different.'

'Swiftly' comes from Old English 'swift,' meaning 'quick,' and 'changed' from Old French 'changier,' meaning 'to alter.'

Initially, 'swiftly' meant 'quickly' and 'changed' meant 'altered,' and this meaning has largely remained the same in modern usage.