Source : Webster's Revised Unabridged Dictionary (1913)

Energetic \En`er*get"ic\, Energetical \En`er*get"ic*al\, a. [Gr.
   ?, fr. ? to work, be active, fr. ? active. See {Energy}.]
   1. Having energy or energies; possessing a capacity for
      vigorous action or for exerting force; active. ``A Being
      eternally energetic.'' --Grew.

   2. Exhibiting energy; operating with force, vigor, and
      effect; forcible; powerful; efficacious; as, energetic
      measures; energetic laws.

   Syn: Forcible; powerful; efficacious; potent; vigorous;
        effective; strenuous. -- {En`er*get"ic*al*ly}, adv. --
        {En`er*get"ic*al*ness}, n.

Source : WordNet®

energetically
     adv : in an energetic manner