'rapidly-changed' originates from the combination of 'rapidly,' an adverb meaning 'quickly,' and 'changed,' the past participle of 'change,' which comes from Old French 'changier,' meaning 'to alter or exchange.'

'changier' transformed into the Middle English word 'chaungen,' and eventually became the modern English word 'change.'

Initially, 'change' meant 'to alter or exchange something,' and this meaning has largely remained the same in modern usage.