If something is unguarded, nobody is protecting it or looking after it.
例句
I should not leave my briefcase and camera bag unguarded.我不该把我的公文包和相机包留在那儿无人看管。
ADJ
轻率的;不留神的
If you do or say something in an unguarded moment, you do or say it carelessly and without thinking, especially when it is something that you did not want anyone to see or know.
例句
The photographers managed to capture Jane in an unguarded moment...摄影师抓拍到了简不经意的瞬间。He was ambushed by a reporter into an unguarded comment.他一不小心被记者套出话来。
英汉词典释义
adj.
无防卫的;无人守护的
They could not leave the city unguarded.他们不能让这座城市不设防。
粗心的,不留神的
She let the news slip by mistake, in an unguarded moment.她一不留神泄漏了消息。
英英词典释义
Adjective
1. lacking protection or a guard;
"an unguarded gate""his unguarded queen was open to attack"
2. displaying or feeling no wariness;
"an unguarded remark""spilled the beans in an incautious moment"