energetic (adj.) Look up energetic at Dictionary.com
1650s, "powerful in operation," from Greek energetikos "active," from energein "to work, be in action, act upon" (see energy). Of persons, "active," in English from 1796 (energetical "operative" is from c.1600; from 1630s as "full of energy," while energical is attested from 1560s). Related: Energetically.