YOU SAID:

I think you're pretty dumb, but I'm not sure

INTO JAPANESE

私はあなたがかなり愚かだと思うが、私はわからない

BACK INTO ENGLISH

I think you are pretty stupid, but I do not know

INTO JAPANESE

私はあなたがかなり愚かだと思いますが、私は知りません

BACK INTO ENGLISH

I think you are pretty stupid, but I do not know