'unusually-combined' originates from the English words 'unusual' and 'combine', where 'unusual' means 'not common' and 'combine' means 'to bring together'.

'unusual' and 'combine' were used separately in Middle English and eventually merged to form the modern English term 'unusually-combined'.

Initially, it meant 'not commonly put together', and this meaning has largely remained the same in modern usage.