The word 'inadvertently-abandoned' is a compound of 'inadvertently' and 'abandoned'. 'Inadvertently' originates from Latin 'inadvertentem', meaning 'unintentional', and 'abandoned' comes from Old French 'abandoner', meaning 'to give up'.

'Inadvertently' evolved from Latin 'inadvertentem' through Middle English, while 'abandoned' transformed from Old French 'abandoner' to modern English 'abandon'.

Initially, 'inadvertently' meant 'unintentional', and 'abandoned' meant 'to give up'. The combined form retains these meanings, indicating something left behind unintentionally.