'carelessly-managed' originates from the combination of 'careless' and 'manage', where 'careless' comes from Old English 'carleas', meaning 'free from care', and 'manage' comes from Italian 'maneggiare', meaning 'to handle'.

'careless' changed from Old English 'carleas' to Middle English 'careles', and 'manage' evolved from Italian 'maneggiare' to Middle English 'managen', eventually forming the modern English term 'carelessly-managed'.

Initially, 'careless' meant 'free from care', but over time it evolved to mean 'lacking attention or care', and 'manage' retained its meaning of 'to handle or control'.