YOU SAID:

I solomly swear that I am up to no good.

INTO JAPANESE

私 solomly は、私はよからぬことを誓います。

BACK INTO ENGLISH

I swear solemnly that I solomly is.

INTO JAPANESE

私は solomly、私は厳粛に誓うです。

BACK INTO ENGLISH

I solomly, I solemnly pledge is.

INTO JAPANESE

私 solomly、私は厳粛に誓うです。

BACK INTO ENGLISH

I solomly, I solemnly pledge is.