un·an·nounced
adjective/ˌʌnəˈnaʊnst/
/ˌʌnəˈnaʊnst/
- happening without anyone being told or warned in advance
未通知的；未预告的；未打招呼的 - She just turned up unannounced on my doorstep.
她未打招呼就来到我家门口了。 - an unannounced increase in bus fares
公共汽车票价未经公告的上涨
Oxford Collocations DictionaryUnannounced is used with these nouns:- visit
- arrive
- She just turned up unannounced on my doorstep.