Formal:
* Despite the impending deadline, the team's approach to the project remained lackadaisical.
* The professor's lackadaisical attitude towards grading discouraged student engagement.
Informal:
* My friend was so lackadaisical about packing for our trip that we almost missed our flight.
* I tried to motivate him to exercise, but his lackadaisical response was, "Maybe tomorrow."
Figurative:
* The once-vibrant city had fallen into a lackadaisical state, with empty shops and deserted streets.
* His lackadaisical performance on stage was a far cry from the dynamic energy he usually possessed.
The word "lackadaisical" conveys a sense of laziness, indifference, and a general lack of enthusiasm or effort.