YOU SAID:

I seriously don't get this

INTO JAPANESE

私は真剣にこれを得ることはありません

BACK INTO ENGLISH

I don't get this seriously

INTO JAPANESE

私はこれを真剣に受け取らない

BACK INTO ENGLISH

I don't take this seriously.

INTO JAPANESE

私はこれを真剣に受け止めません。

BACK INTO ENGLISH

I don't take this seriously.