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Adjective: unenergetic  ,ún,e-nu(r)'je-tik
  1. Deficient in alertness or activity
    "bullfrogs became unenergetic with the first cold nights";
    - lethargic
  2. Not inclined to be enterprising
    - slowgoing

See also: dazed, dreamy, foggy, groggy, inactive, lackadaisical, languid, languorous, listless, logy [N. Amer], nonenterprising, stuporous, unenterprising