The Sacral Center is the source of life force. It is reproductive, life sustaining energy. The defined Sacral has the capacity to sustain work and create in the world. The Sacral is a response motor and regenerates itself through the correct application of its energy. However, the opposite is also true: it can degenerate into frustration when forced to do work that is not satisfying.
The undefined Sacral means that there is no consistent access to life force. Many people with undefined Sacral centers take in and amplify the energy around them, and end up way overdoing what is energetically correct for them, trying to keep up with the world of the generator. This can be an addiction to energy and sex. The wisdom here is to witness how energy works without getting lost in it. The question is “Do I know when enough is enough?”