The best synonym for discernment is cleverness. A clever teammate is both creative and simple at the same time. Clever teammates have the ability to think quickly on their feet. They have a knack for getting the most out of the resources available. They know when matters are complicated and they simplify things with a solution no one else was able to see. They also see when a more sophisticated solution needs to be applied and they begin the prep for that solution way ahead of time and then deliver in a way that seems magical in the moment. Cleverness is great to work with and annoying to work against. That makes a clever teammate a valuable asset on a team that wants to play smarter.