Etymology
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energetic (adj.)

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.

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Definitions of energetic

energetic (adj.)
possessing or exerting or displaying energy;
an energetic fund raiser for the college
it caused an energetic chemical reaction
an energetic group of hikers
energetic (adj.)
working hard to promote an enterprise;
Synonyms: gumptious / industrious / up-and-coming
From wordnet.princeton.edu