她为她毫不知情的丈夫举办了一个惊喜聚会。

She threw a surprise party for her unsuspecting husband.

《柯林斯英汉双解大词典》

在对方不知情的情况下模仿对方的动作。

Imitate their partners' gestures without their knowing it.

youdao

那个男孩继续干着，显然不知情的样子。

The boy worked on, apparently unconscious.

youdao

So even without there being an Attorney General, somebody might be awake in the justice department and notice that that's actually illegal.

就算是司法部长不知情,司法部门也会有人会发现,这样的协议是违法的

耶鲁公开课 - 博弈论课程节选

I think that having a forced voter turnout would only force an uninformed vote.

我认为，强制选民投票的结果是不知情的投票。

对于义务投票制 - SpeakingMax英语口语达人

Shelly Kagan Whether or not I'm Shelly Kagan,the guy that was lecturing to you on Thursday, depends on whether,unbeknownst to me,over the weekend, somebody removed half of my brain,stuck it in some other torso, sealed me all back up.

我是否是上周四给你们讲课的，取决于周末在我不知情的情况下，是否有人移除我半个大脑放入另一躯体，然后合起来。

耶鲁公开课 - 死亡课程节选