The Root center has to do with drive, adrenaline, grounding, vitality, and the pressure to act. It is both a motor and a pressure center.
Defined Root
Brings energetic fuel to the design and the pressure to act, as well as a consistent pace and way of handling stress. Reliable source of vitality and drive, which benefits from regular activity fueled by an internal pressure seeking release. In an unhealthy state, pressures others, overwhelming them and expecting them to act with the same level of drive and energy, or represses natural drive, leading to health problems and depression.
Undefined Root
Can see who is under pressure to act and who has the vitality and drive to act. Inconsistent pace and drive. In an unhealthy state, acts out of stress and pressure rather than from personal authority, has an unrealistic sense of how long things actually take, and tries to do too much, too fast in order to relieve pressure and stress and feel free. Life always brings more pressure, but we do not have to let it control our actions.