energetic

adj. vigorous, full of energy

This article is about the physical quantity: for other uses of the word "energy", see Energy (disambiguation).* In physics and other sciences, energy (from the Greek ενεργός, energos, "active, working") is a scalar physical quantity that is a property of objects and systems of objects which is conserved by nature. Several different forms, such as kinetic, potential, thermal, electromagnetic, chemical, nuclear, and mass have been defined to explain all known natural phenomena.
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Adjective
1. possessing or exerting or displaying energy; "an energetic fund raiser for the college"; "an energetic group of hikers"
(antonym) lethargic, unergetic
(similar) active, physical
(see-also) active
2. working hard to promote an enterprise
(synonym) gumptious, industrious, up-and-coming
(similar) enterprising

(a.)
Alt. of Energetical
  

power...