a) sadly
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b) joyously
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c) unexpectedly
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If something happens out of the blue, it means it was totally unexpected, a complete surprise.
French translation
sans prévenir, de manière inattendue, venant de nulle part, de but en blanc
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Examples in context
‘Out of the blue : David Bowie’s new single is rock’s best kept secret
ONCE the music-buying public had absorbed the shock of the news, read out breathlessly on the usually staid Today program on BBC radio, that David Bowie had released his first single for a decade, there was only one question on their minds : is it any good ?’
The Times, 9 Jan. 2013
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‘Who should take over at the Royal Opera House ?
When Tony Hall was appointed chief executive of the Royal Opera House, his name came as a bolt out of the blue. Will his successor be equally unlikely : or will he or she be one of the usual suspects ?’
Guardian.co.uk, 23 Nov. 2012
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Everyday usage
He seemed to be very happy in his job, so his resignation came out of the blue.
her brother showed up at the wedding out of the blue.
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