'unvendible' originates from the prefix 'un-' meaning 'not' and the root 'vendible' from Latin 'vendibilis', where 'vendere' meant 'to sell'.

'vendibilis' transformed into the Old French word 'vendible', and eventually became the modern English word 'vendible', with 'un-' added to form 'unvendible'.

Initially, it meant 'not able to be sold', and this meaning has largely remained the same in modern usage.