A bad business partner can be described as a CROOK, which is a person who engages in dishonest or illegal activities. This type of person is often untrustworthy and may take advantage of their business partners for their own personal gain. They may also be involved in fraudulent activities such as embezzlement or money laundering. A bad business partner can have a negative impact on the success of a business, as they are not likely to act in the best interests of the company.