'immaculately-built' is a compound word formed from 'immaculately' and 'built.' 'Immaculately' comes from the adverb form of 'immaculate,' meaning 'perfectly clean or pure,' and 'built' is the past participle of 'build.'

'Immaculate' comes from the Latin word 'immaculatus,' meaning 'unstained,' and 'built' comes from Old English 'byldan.' The phrase 'immaculately-built' is a modern English compound, likely emerging in the late 20th or early 21st century to describe physical perfection.

Initially, 'immaculate' meant 'without stain,' but in modern usage, 'immaculately-built' refers to something constructed or formed in a flawless, perfect manner.