1. lacking spirit or liveliness

- a lackadaisical attempt

Similar word(s): lethargic, unenergetic, languid, languorous

2. idle or indolent especially in a dreamy way

- she was annoyingly lackadaisical and impractical

- a...lackadaisical, spiritless young man-about-town

Similar word(s): idle

Sentences with lackadaisical as an adjective:

- the lackadaisical look on his face