'unexpectedly-modified' is a compound word formed from 'unexpectedly' and 'modified'. 'Unexpectedly' originates from the Latin 'ex-' meaning 'out of' and 'pectare' meaning 'to look', while 'modified' comes from the Latin 'modificare', where 'modus' meant 'measure' and 'facere' meant 'to make'.

'Unexpectedly' evolved from the Old French 'expecter', while 'modified' transitioned from the Latin 'modificare' to the Old French 'modifier', eventually becoming the modern English 'modify'.

Initially, 'unexpectedly' meant 'not foreseen', and 'modified' meant 'to make changes'. The compound form retains these meanings, indicating a change that was not foreseen.