If lack of attraction doesn’t stop them, usually something else will.
It is a combination that gives in to outer circumstances and things that are out of their control.
If they remain rational in their mental relations, they could have a lot of fun that other signs wouldn’t be able to understand.
The satisfaction they will both get from serious problem solving might lead them to a point where they find a solution together, Libra puts it in words and Capricorn puts it in action.
Libra is a sign ruled by Venus and their emotions come naturally, but usually restricted and held back due to the seriousness of their nature and the judgment of others they fear.
Capricorn has a mission in life to accept all emotion, and in most cases, unless enlightened, they will be this judgmental force that holds Libra down.
Air and Earth are too far apart and it seems unclear to these partners how to reach each other on any issue in life.
Still, there is a prudence to both of them that might give them just enough depth and understanding to have very interesting discussions and motivate each other to build a better foundation for every next debate.
This can be a long battle, with no winners or losers, simply two people always building walls between each other, for reasons that aren’t clear to anyone around them.
The biggest obstacles to their understanding are the elements they belong to.
The best thing these two can do together is be boring to the rest of the world.
There is a great chance they will be lulled by their relationship to the state of hard work and lazy rest, with no effort for anything creative or inspiring.
The emotional nature of Capricorn makes them distant for many, but completely untouchable for Libra as soon as they start dismissing their feelings.