'carelessly-changed' originates from the combination of 'carelessly' and 'changed', where 'carelessly' is derived from 'careless', meaning 'without care', and 'changed' is the past participle of 'change', meaning 'to make different'.

'carelessly' evolved from the Old English word 'carleas', meaning 'free from care', and 'changed' from the Old French 'changier', meaning 'to alter'.

Initially, 'carelessly' meant 'without care or concern', and 'changed' meant 'altered'. Together, they convey the idea of something altered without attention to detail.