The term 'BAD DEED' can be broken down into two crossword solutions: WRONG (5 letters) and SIN (3 letters). A bad deed is an act that is considered immoral or unethical. It is usually something that goes against the law or social norms, and it can have serious consequences. WRONG is a synonym for bad deed, as it implies that the action was not right or proper. SIN is another word for bad deed, as it implies that the action was morally WRONG and against religious teachings.