'unexpectedly-correct' originates from the combination of 'unexpectedly' and 'correct', where 'unexpectedly' is derived from 'unexpected', meaning 'not anticipated', and 'correct', meaning 'free from error'.

'unexpectedly' evolved from the Old English 'un-' meaning 'not' and 'expected', while 'correct' comes from the Latin 'correctus', meaning 'set right'.

Initially, 'unexpectedly' meant 'not foreseen', and 'correct' meant 'set right'. Together, they evolved to mean 'accurately correct in a surprising manner'.