'irregularly-shipped' originates from the combination of 'irregularly' and 'shipped', where 'irregularly' is derived from Latin 'irregularis', meaning 'not regular', and 'shipped' from Old English 'scipian', meaning 'to send by ship'.

'irregularly' changed from the Latin 'irregularis' to the Middle English 'irreguler', and eventually became the modern English word 'irregularly'. 'Shipped' evolved from the Old English 'scipian' to the Middle English 'shippen', and eventually became the modern English word 'shipped'.

Initially, 'irregularly' meant 'not regular', and 'shipped' meant 'to send by ship'. Over time, 'irregularly-shipped' evolved to describe items sent in a non-standard manner.