When it comes to describing dubious or suspicious businesses, there are a number of different words and phrases that can be used to convey the same meaning. Some synonyms for the term "shady businesses" include sketchy operations, questionable enterprises, unsavory companies, and unreliable establishments. These words all suggest that the business in question may be involved in illegal or unethical practices, and that it may not be a trustworthy source of goods or services. Other similar phrases include fly-by-night businesses, underhanded companies, and disreputable firms. Regardless of the term used, it is important to identify and avoid shady businesses in order to protect oneself from potential harm or loss.