'carelessly-arranged' originates from the combination of 'careless' and 'arranged', where 'careless' means 'without care' and 'arranged' means 'put in order'.

'careless' changed from the Old English word 'carleas', meaning 'free from care', and 'arranged' from the Old French 'arranger', meaning 'to set in order'.

Initially, 'careless' meant 'free from care', but over time it evolved to mean 'lacking attention or consideration'.