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Adjective: lethargic  lu'thaa(r)-jik
  1. Deficient in alertness or activity
    "bullfrogs became lethargic with the first cold nights";
    - unenergetic

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

Antonym: energetic

Encyclopedia: Lethargic