'unusually-formed' originates from the combination of 'unusual' and 'formed', where 'unusual' means 'not common' and 'formed' means 'having a specific shape or structure'.

The term 'unusually-formed' evolved from the combination of 'unusual' and 'formed', which have been used in English since the 14th and 15th centuries respectively.

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