'roughly-built' originates from the combination of 'roughly,' meaning 'in a rough manner,' and 'built,' the past participle of 'build,' meaning 'to construct.'

'roughly-built' combines the adverb 'roughly' with the past participle 'built' to describe something constructed in a rough manner.

Initially, it meant 'constructed in a rough manner,' and this meaning has largely remained the same in modern usage.