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Adjective: lackadaisical  ,la-ku'dey-zi-kul
  1. Lacking spirit or liveliness
    "a lackadaisical attempt";
    - dreamy, languid, languorous
  2. Idle or indolent especially in a dreamy way
    "she was annoyingly lackadaisical and impractical"; "a...lackadaisical, spiritless young man-about-town"

See also: idle, lethargic, unenergetic

Encyclopedia: Lackadaisical