YOU SAID:

My younger sister is a bra-less troublemaker

INTO JAPANESE

うちの妹はノーブラ問題児です

BACK INTO ENGLISH

My younger sister is a problem child who doesn't wear a bra.

INTO JAPANESE

うちの妹はブラジャーを着けない問題児。

BACK INTO ENGLISH

My younger sister is a problem child who doesn't wear a bra.