'unstably-built' originates from the English word 'unstable,' which is derived from the Latin word 'instabilis,' where 'in-' meant 'not' and 'stabilis' meant 'standing firm.'

'unstable' changed from the Latin word 'instabilis' and eventually became the modern English word 'unstable.'

Initially, it meant 'not standing firm,' but over time it evolved into its current meaning of 'lacking stability.'