YOU SAID:
My sister thinks that I am very dumb and stupid.
INTO JAPANESE
私の妹は私がとても馬鹿で愚かだと思っています。
BACK INTO ENGLISH
My sister thinks I'm very stupid and stupid.
INTO JAPANESE
私の妹は私がとても愚かで愚かだと思っています。
BACK INTO ENGLISH
My sister thinks I'm so stupid and stupid.
INTO JAPANESE
私の妹は私がとても愚かで愚かだと思っています。
BACK INTO ENGLISH
My sister thinks I'm so stupid and stupid.
Come on, you can do better than that.