unannounced

汉语翻译

英语解释：

形容词 unannounced:

1. without warning or announcement- M.A.D.Howe
   同义词：unheralded, unpredicted

例句：

1. He entered unannounced.
   他未经通报便进出。
2. Having arrived unannounced for supper, we had to take potluck.
   由于没有提前通知我们要来吃晚饭，我们只能吃些家常便饭