YOU SAID:

The thing thou doest is not good.

INTO JAPANESE

汝が行うことは良くない。

BACK INTO ENGLISH

What thou shalt do is not good.

INTO JAPANESE

あなたが行うことは良いものではありません。

BACK INTO ENGLISH

What you do is not a good thing.

INTO JAPANESE

あなたがすることは良いことではありません。

BACK INTO ENGLISH

It's not a good thing for you to do.

INTO JAPANESE

君にとって良いことではありません。

BACK INTO ENGLISH

It's not good for you.

INTO JAPANESE

君のために　よくないよ

BACK INTO ENGLISH

It's not good for you.