'unexpectedly-released' originates from the combination of 'unexpectedly' and 'released', where 'unexpectedly' comes from 'unexpected', meaning 'not anticipated', and 'released' from 'release', meaning 'to set free'.

'unexpectedly-released' combines the adverb 'unexpectedly' with the past participle 'released', forming a compound adjective.

Initially, 'unexpectedly' meant 'not expected', and 'released' meant 'set free'. Together, they convey the idea of something being set free without prior notice.