No seriously, say it twice.''

不，我是认真的，再说一次。

youdao

"You're not really seriously considering this thing, are you?"—"No, of course not."

“你没有真正认真地考虑这件事，对吧？”—“没有，当然没有。”

《柯林斯英汉双解大词典》

Unfortunately, no one took my opinion seriously.

不幸的是，没有人严肃地看待我的意见。

《柯林斯英汉双解大词典》

- BOY: Cute.- Really, no. Seriously, you should. Don't touch me.

VOA: standard.other

Locke thought no, you couldn't possibly take this view seriously if you thought about what it meant.

洛克认为这不可能，只要想想这意味这什么,你就不可能相信这个观点。

耶鲁公开课 - 死亡课程节选

And of course, no one took him seriously.

自然没有人把他当真。

哈佛公开课 - 幸福课课程节选

But our focus is on moving quickly with intensity and determination -- collegiality and optimism -- to reach an agreement -- (laughter) -- no seriously, to reach an agreement in the negotiations being led by the Vice President on deficit reduction and dealing with our long-term debt.

WHITEHOUSE: Press Briefing

No one seriously imagines that peace can come to the Middle East without America.

ECONOMIST: The 44th president

No, seriously, scientist-activists and their media allies have alleged each of the above, and then some.

FORBES: Finding Big Foot, Finding Global Warming