'uncertainly-built' originates from the combination of 'uncertainly' and 'built', where 'uncertainly' is derived from 'uncertain', meaning 'not sure or confident', and 'built' from 'build', meaning 'to construct'.

'uncertainly' changed from the Middle English word 'uncertain', and 'built' from the Old English 'byldan', eventually forming the modern English term 'uncertainly-built'.

Initially, 'uncertainly' meant 'not sure', and 'built' meant 'constructed'. Together, they evolved to describe something constructed in an unstable manner.