'vigorously-built' originates from the word 'vigor,' which comes from Latin 'vigor,' meaning 'liveliness or energy.' The suffix '-ly' is used to form adverbs, and 'built' is derived from Old English 'byldan,' meaning 'to construct.'

'Vigor' transformed from Latin 'vigor' to Old French 'vigour,' and eventually became the modern English word 'vigor.' 'Built' evolved from Old English 'byldan' to Middle English 'bilden,' and eventually became 'built.'

Initially, 'vigor' meant 'liveliness or energy,' and 'built' meant 'to construct.' Over time, 'vigorously-built' evolved to describe something constructed with strength and energy.