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Lackadaisical
Unmotivated Behavior
Use 'lackadaisical' to describe someone who seems uninterested or unwilling to put in effort. 
Informal Tone
'Lackadaisical' is moderate in formality, suitable for casual or creative contexts but not formal documents. 
Not Always Negative
While often critical, 'lackadaisical' can describe a laid-back quality that's positive in a relaxed setting. 