Occasionally, you will see a planet that is not aspected by another planet. This means that the major aspects listed above (and planets not in a parallel/contra parallel relationship, a term having to do with their north-south latitude positioning, known as declination) are not aspected with another planet.
It is almost as if that planet does not know how to relate in the world. A person with an unaspected planet must learn to integrate the nature of that planet into their life. An example of an unaspected Venus is a person who seems to have this magnetic charm and beauty, yet is oblivious to the reaction they receive from people who are attracted to them.