'rapidly-built' originates from the English word 'rapidly,' which comes from the Latin word 'rapidus,' meaning 'swift,' and 'built,' from the Old English 'byldan,' meaning 'to construct.'

'rapidly' changed from the Latin 'rapidus' to the modern English 'rapidly,' and 'built' evolved from the Old English 'byldan' to the modern English 'built.'

Initially, 'rapidly' meant 'swiftly,' and 'built' meant 'to construct,' which has largely remained the same in modern usage.