'strongly-built' originates from the combination of 'strongly' and 'built', where 'strongly' is derived from 'strong', meaning 'having great physical power', and 'built' is the past participle of 'build', meaning 'to construct'.

'strongly-built' evolved from the Old English word 'strang' (strong) and 'byldan' (to build), eventually forming the modern English term 'strongly-built'.

Initially, it meant 'constructed with strength', and this meaning has largely remained the same in modern usage.