'carelessly-prepared' originates from the combination of 'careless' and 'prepare,' where 'careless' meant 'without care' and 'prepare' meant 'to make ready.'

'careless' changed from the Old English word 'carleas' and 'prepare' from the Latin word 'praeparare,' eventually forming the modern English term 'carelessly-prepared.'

Initially, 'careless' meant 'free from care,' but over time it evolved into its current meaning of 'negligent.'