Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Origin: lackaday expression of sadness (17-19 centuries), from alack the day

lackadaisical

 adjective
     
lack‧a‧dai‧si‧cal
not showing enough interest in something or not putting enough effort into it:
David has a rather lackadaisical approach to his work.
Definition from the Longman Dictionary of Contemporary English
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