Synonyms of unannounced
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unexpectedIf an event or someone's behaviour is unexpected, it surprises you because you did not think that it was likely to happen.
• His death was totally unexpected.
unforeseensurprisingunanticipatedchancesuddenastonishingstartlingunpredictableaccidentalabruptout of the blueunannouncedfortuitousunheraldedunlooked-fornot bargained for
unforeseenIf something that has happened was unforeseen, it was not expected to happen or known about beforehand.
• Due to unforeseen circumstances, the show has been cancelled.
unexpectedunanticipatedunpredictedsurprisesurprisingsuddenstartlingaccidentalabruptout of the blueunlooked-forunenvisaged
unheraldedIf you describe something that happens as unheralded, you mean that you did not expect it, because nobody mentioned it beforehand.
• The complete reversal of this policy was unheralded.
Thesaurus for unannounced from the Collins English Thesaurus