Lackadaisical Definition
 lăkə-dāzĭ-kəl 
    adjective
  
 Showing lack of interest or spirit; listless; languid.
 Webster's New World 
Synonyms: 
  Origin of Lackadaisical
-  
From the archaic interjection lackaday, lackadaisy.
From Wiktionary
 From lackadaisy alteration of lackaday
From American Heritage Dictionary of the English Language, 5th Edition
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