1. in a manner lacking enthusiasm, energy, or interest; without vigor or purpose
Usage: common in formal and informal contexts

Examples

• She lackadaisically flipped through the magazine without really reading it.
• The students lackadaisically completed their homework, showing little interest in the assignment.
• He walked lackadaisically through the museum, barely glancing at the paintings.
• The team played lackadaisically in the first half, trailing by ten points.
• She responded lackadaisically to his proposal, neither excited nor opposed.
• The workers lackadaisically swept the floor, clearly wanting to leave early.