There are several synonyms for the phrase "play fast and loose." Some of these synonyms include being reckless, careless, taking chances, being loose with the rules, or even being deceitful. When someone "plays fast and loose," they may be taking actions without fully considering the consequences or breaking established norms or rules. Other synonyms for this phrase may include being inconsistent, unreliable, or unpredictable. These terms suggest that the individual in question may be difficult to trust or rely on, making it important to be cautious when working or interacting with them.