Great energy, drive, force, or power; vigour of body, mind or personality; oomph or pizzazz
Dynamic reality; active energy; continuous change, progress, or activity.
Any of several philosophical theories that attempt to explain the universe by an immanent force.
A condition characterized by extreme fatigue or drowsiness, deep unresponsiveness, or prolonged sleep patterns.
A state of extreme torpor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness.