WordWeb Online

1. Possessing, exerting or displaying energy
   "an energetic fund raiser for the college"; "an energetic group of hikers"; "it caused an energetic chemical reaction"
    
2. Working hard to promote an enterprise
   - gumptious, industrious
    
3. (physics) of or relating to energy

See also: active, alert, brisk, canty [UK, dialect], driving, dynamic, dynamical, enterprising, go-getting [informal], high-energy, indefatigable, lively, merry, physical, rattling, snappy [informal], spanking [informal], spirited, strenuous, tireless, unflagging, unwearying, vigorous, zappy [informal], zippy [informal]

Antonym: unenergetic

Encyclopedia: Energetic