'unexpectedly-continued' is a compound word formed from 'unexpectedly' and 'continued'. 'Unexpectedly' originates from the Latin word 'exspectare', meaning 'to look out for', and 'continued' comes from the Latin 'continuare', meaning 'to join together'.

'Unexpectedly' evolved from the Old French 'expecter', while 'continued' evolved from the Old French 'continuer'.

Initially, 'unexpectedly' meant 'not looked for', and 'continued' meant 'to keep going'. Together, they describe something that persists without prior anticipation.