Webster's English Dictionary

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energetic

Cross references:
  1. vigorous              
 
en.er.get.ic \.en-*r-'jet-ik\ \-i-k(*-)le-\ aj [Gk energe-tikos, fr. 
   energein to be active, fr. energos] 1: marked by energy : STRENUOUS  2: 
   operating with vigor or effect  3: of or relating to energy {~ equation}  - 
   en.er.get.i.cal.ly av