Lowly things aren't considered to be important or impressive. Your lowly position on a sports team might make you best suited to carry all of the players' equipment.
When a person is described as lowly, the world often refers to their job or social class. A lowly janitor might not get as much respect as the CEO of a huge company, even if she's a kinder person. A lowly member of an AAA baseball team might only dream about joining the major leagues. The adjective lowly has been around since the 14th century, from low, "not high," and also "humble in rank."