YOU SAID:
My sister is a weird potato.
INTO JAPANESE
私の妹は変なじゃがいもです。
BACK INTO ENGLISH
My sister is a strange potato.
INTO JAPANESE
私の妹は変わったじゃがいもです。
BACK INTO ENGLISH
My sister is a changed potato.
INTO JAPANESE
私の妹は変わったじゃがいもです。
BACK INTO ENGLISH
My sister is a changed potato.
That didn't even make that much sense in English.