unannounced

Word family  noun announcement announcer adjective unannounced verb announce adverb unannounced

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++un·an·nounced /ˌʌnəˈnaʊnst◂/ adjective, adverb  EXPECThappening without anyone expecting or knowing about it 出人意料的[地]；未经通报的[地] We arrived unannounced. 我们到得很突然。

Examples from the Corpus

unannounced• My brother is famous for showing up at our houses unannounced, usually around dinner time.• an unannounced visit• Investigators from the health department made unannounced visits to the hospital in March.

un·an·nounced adjectiveChineseSyllable  

Corpus knowing expecting it without about or anyone happening

unannounced
un‧an‧nounced /ˌʌnəˈnaʊnst◂/ adjective, adverbhappening without anyone expecting or knowing about it:
    We arrived unannounced.

un·announcedBrE /ˌʌnəˈnaʊnst/ 🔊NAmE /ˌʌnəˈnaʊnst/ 🔊 adjectivehappening 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