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unannounced ( Adjective)
UK/US /ˌʌnəˈnaʊnst/
Comparative
more unannounced
Superlative
most unannounced
1-
B1
unknowingly happening without any warnings
-> You can’t come in to my office unannounced.
-> Apparently he went to Bahamas unannounced.
Synonym
Uninformed