'perfectly-built' is a compound word formed from 'perfectly' and 'built.' 'Perfectly' comes from 'perfect,' which originates from Latin 'perfectus,' meaning 'completed' or 'finished,' and 'built' is the past participle of 'build,' from Old English 'byldan.'

'Perfectly-built' is a modern English compound, combining 'perfectly' (from Middle English 'parfitly') and 'built' (from Old English 'byldan'), to describe something constructed in an ideal way.

Initially, 'built' simply meant 'constructed,' but in the compound 'perfectly-built,' it evolved to describe an ideal or flawless physical form, especially of a body.