YOU SAID:

I dont speak japanese but i do speak idiot.

INTO JAPANESE

私は日本語を話せませんが、ばかを話します。

BACK INTO ENGLISH

I don't speak Japanese, but I speak stupid.

INTO JAPANESE

私は日本語を話せませんが、私は愚かなことを話します。

BACK INTO ENGLISH

I don't speak Japanese, but I speak silly things.

INTO JAPANESE

私は日本語を話せませんが、ばかげたことを話します。

BACK INTO ENGLISH

I don't speak Japanese, but I speak silly things.