Which competencies must a manager have for us to say that he is a true professional?

Many will be quick to say: “The most obvious sign of a manager’s competence is that he or she achieves good outcomes.” Such a simple answer seems to be in many ways too populist and often irresponsible. We can accept such an answer only from someone who really knows what he or she is talking about, understands the issue in detail and is personally able to achieve such an outcome, all other parameters being equal. We will not accept it as an answer from others.