out of the blue

Adverb
  1. In a way that was not expected (synset 400041131)
    "her brother showed up at the wedding out of the blue"
Adjective
  1. Not anticipated (synset 300934006)
    "unanticipated and disconcerting lines of development"; "unforeseen circumstances"; "a virtue unlooked-for in people so full of energy"; "like a bolt out of the blue"; "unseen problems"

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