The term 'mistakenly-modified' is a compound word formed from 'mistakenly' and 'modified'. 'Mistakenly' originates from the word 'mistake', which comes from Old Norse 'mistaka', meaning 'to take in error'. 'Modified' comes from Latin 'modificare', meaning 'to measure or limit'.

'Mistakenly' evolved from Middle English 'mistaken', while 'modified' evolved from Middle English 'modifien'.

Initially, 'mistakenly' meant 'in error', and 'modified' meant 'altered'. The combined term retains these meanings, indicating an alteration made in error.