out of the blue
adjective
1 out of the blue
Not anticipated:
— Like a bolt out of the blue.
synonyms: unanticipated, unforeseen, unlooked-for, unseen.
adverb
1 out of the blue
In a way that was not expected:
— Her brother showed up at the wedding out of the blue.
synonym: unexpectedly.
Moby thesaurus: extraordinary, improbable, more than expected, out-of-the-way, past expectation, sudden, unannounced, unanticipated, undivined, unexpected, unforeseeable, unforeseen, unguessed, unheralded, unhoped for, unpredictable, unpredicted, unprepared for, without warning.
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