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English definition of “unannounced”

unannounced

adjective, adverb     /ˌʌn.əˈnaʊnst/
If someone arrives unannounced, they arrive suddenly and unexpectedly: She appeared unannounced and took control of the meeting.Not expected or planned
(Definition of unannounced adjectiveadverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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