1. Possessing, exerting, or displaying energy.
    Cosmic rays are energetic particles from outer space.
    Those kids are so energetic: they want to run around playing all day.
  2. Of or relating to energy.
    energetic laws

The above text is a snippet from Wiktionary: energetic
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!