'inadvisability' originates from the Latin word 'advīsābilis,' where 'ad-' meant 'toward' and 'vīsābilis' meant 'able to be seen or considered.'

'advīsābilis' transformed into the Old French word 'aviser,' and eventually became the modern English word 'advise,' from which 'inadvisable' and 'inadvisability' are derived.

Initially, it meant 'able to be seen or considered,' but over time it evolved into its current meaning of 'not recommended or suitable.'