Virtue

A pre political society has people that are inherently one way or another. All sorts of political thinkers vary their opinions on this and there is no correct answer to this. Hobbes thought all people were inherently evil and sacrificed freedoms to maintain peace, hence any gov being good gov, people naturally competitive so forth. I mention this because I assume the opposite that everyone is naturally cooperative and that virtues are demonstrative positive attributes to people. Lack of a virtue is negative in itself and needs no polar opposite. So viciousness would lack of compassion and lack of some other independent attribute. I haven't sat down and thought of the virtues as features, but I'd probably use utility, creativity, compassion, constraint, wisdom, agility, and ability.
Lethargy would be lack of utility and ability. So forth.
Just my own little theory. I borrow from catholic(universal) theology's virtues a tad, but mostly my own spin.

I think your view on virtues depends on your view of people innately. If people are innately peaceful in your opinion, then assume they possess pos attributes from the start, if neg view on people in state of nature, then neg view on attributes. Christianity depicts its members as inherently evil by lineage, and assumes that they strive to become virtuous. That was Thomas Aquinas, the catholic saint and philosophers view point.

Anyway, This is not a religious debate, it's just that the best philosophers in my humble opinion were the ones that contested religious ideals.

Plato is my personal favorite though. The analogy of the cave was one of my favorite stories ever. love it.

Something I'd like to add. To compare us to animals is fair, but think of this: from a sociological point of view, a professional is one who strives for excellence (not perfection, there is no perfection to a professional) in their field or expertise and compares only to those other professionals in that field. Animals have insufficient mental capacity to evaluate and perform the types of analysis on themselves that makes them capable of determining whether or not they can enhance or falter in the process of being virtuous. Thus, making it improper to really compare animal to man. Sand is no more virtuous than plant by this standard, but girl can be more virtuous than boy or specific comparable better than specific comparable and like. It allows for more accurate comparison. The ability to reason is what makes us human. It used to be tool use, but since a monkey is able to grab a honey stick, cross over a hill, and then jab the honey stick into an anthill to pull out a delicious treat utilizing the stick as a tool, we are now classified as the only species that has the ability to reason.

Agree?