'robustly-constructed' originates from the Latin word 'robustus,' meaning 'strong' and the Latin word 'construere,' meaning 'to build.'

'robustus' transformed into the Old French word 'robuste,' and eventually became the modern English word 'robust.' Similarly, 'construere' evolved into the Old French 'construire,' leading to the modern English 'construct.'

Initially, 'robust' meant 'strong and healthy,' but over time it evolved to describe objects that are 'strongly built.'