The brown greater galago is a medium-sized primate, with a robust body that is covered in dense, woolly fur. Typically, the fur's primary coloration is grey-brown, with a marked contrasting lighter underbelly. A striking feature is its long and bushy tail, which is nearly twice as long as the body. There are slight differences in males and females, with males being slightly larger in size. Despite these dissimilarities, both genders share the thick eye-rings that give them a distinctive appearance.