There are a plethora of synonyms available for the phrase "lousy deal." Some of the more common options include "bad bargain," "poor agreement," or simply "terrible deal." Other options might include phrases like "rip-off," "scam," or "swindle," which suggest a more intentional exploitation of the person agreeing to the deal. Alternatively, more colloquial expressions might be used, such as "getting ripped off," "getting taken for a ride," or "getting the short end of the stick." Ultimately, the choice of synonym is likely to depend on the speaker's tone, intended audience, and context, as well as the severity of the disappointment or frustration associated with the deal in question.