unannounced，英语单词，主要用作为形容词，用作形容词译为“ 突然的；未经宣布的；未通知的”。

英 [ˌʌnəˈnaʊnst] 美 [ˌʌnəˈnaʊnst]

adj. 突然的；未经宣布的；未通知的

柯林斯英汉双解大词典

unannounced /ˌʌnəˈnaʊnst/

1.ADJ If someone arrives or does something unannounced, they do it unexpectedly and without anyone having been told about it beforehand. 未事先通知的

You come over unannounced 你悄然而至 ; 你一声不响地走过来 ; 您悄然而至

unannounced inspection 无事先通知的检察 ; 飞行检查 ; 不通知视察

unannounced satellite 秘密卫星

Unannounced Game Title 开发人员和未公开游戏

limited frequency unannounced access 有限次数未预告接近

Unannounced Monitoring 未通告的监测

unannounced quiz 临时测验

sudden unannounced investigation 突击检查

Unannounced Transfer 未宣告的转接

1、She just turned up unannounced on my doorstep. 她未打招呼就来到我家门口了。

2、He had just arrived unannounced from South America. 他刚从南美来，事先也没通知。

3、Much to the shock of everyone, Palmer comes unannounced to CTU. 很多反恐组的工作人员大吃一惊，帕默竟然没有打招呼就来到了反恐组。