'unexpectedly-ended' originates from the combination of 'unexpectedly' and 'ended'. 'Unexpectedly' comes from 'unexpected', which is derived from the Latin 'ex-' meaning 'out of' and 'pectare' meaning 'to look'. 'Ended' is the past participle of 'end', which comes from the Old English 'endian', meaning 'to bring to a conclusion'.

'unexpectedly-ended' combines the adverb 'unexpectedly' with the past participle 'ended', forming a compound adjective used to describe an unforeseen conclusion.

Initially, 'unexpectedly' meant 'not expected', and 'ended' meant 'brought to a conclusion'. Together, they describe something that concluded without prior anticipation.