Meaning of “unannounced” in the English Dictionary

"unannounced" in American English

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unannouncedadjective, adverb [ not gradable ]

us /ˌʌn·əˈnɑʊnst/

sudden and unexpected:

Several unannounced acts made this concert special.
The President appeared unannounced.

(Definition of “unannounced” from the Cambridge Academic Content Dictionary © Cambridge University Press)