YOU SAID:

No way I didn’t know seriously

INTO JAPANESE

私は真剣に知らなかった

BACK INTO ENGLISH

I did not know seriously.

INTO JAPANESE

私は真剣に知りませんでした。

BACK INTO ENGLISH

I seriously did not know.

INTO JAPANESE

知らなかった

BACK INTO ENGLISH

- I didn't know! - You did!

INTO JAPANESE

知らなかった

BACK INTO ENGLISH

- I didn't know! - You did!