'unexpectedly-changed' originates from the combination of 'unexpectedly' and 'changed'. 'Unexpectedly' comes from 'unexpected', which is derived from Latin 'ex-' meaning 'out of' and 'pectare' meaning 'to look'. 'Changed' comes from Old French 'changier', which is from Latin 'cambiare' meaning 'to exchange'.

'Unexpectedly' evolved from Middle English 'unexpectid', while 'changed' evolved from Middle English 'chaungen'.

Initially, 'unexpectedly' meant 'not looked for', and 'changed' meant 'to make different'. Over time, they combined to describe something altered without prior notice.