'unconventionally-arranged' originates from the combination of 'unconventional' and 'arranged'. 'Unconventional' comes from 'un-' meaning 'not' and 'conventional' meaning 'based on what is generally done'. 'Arranged' comes from the Old French 'arranger', meaning 'to set in order'.

'Unconventionally-arranged' evolved from the combination of 'unconventional' and 'arranged', which were used separately in Middle English and later combined in modern English.

Initially, 'unconventional' meant 'not following traditional forms', and 'arranged' meant 'set in order'. Together, they evolved to describe something organized in a non-traditional way.