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English definition of “unannounced”

unannounced

adjective, adverb uk   /ˌʌn.əˈnaʊnst/ us  
If someone arrives unannounced, they arrive suddenly and unexpectedly: She appeared unannounced and took control of the meeting.Not expected or planned

unannounced

adjective uk   /ˌʌn.əˈnaʊnst/ us  
not made publicly known: The Texan singer will be supported by two other bands, as yet unannounced.Announcing, informing and stating
(Definition of unannounced from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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