Lackadaisical means doing things without energy or care. A lackadaisical attitude, lackadaisical about it, lackadaisical performance.
It is a complaint about effort rather than ability. The word comes from the old exclamation lackaday, which was a sigh of regret, so somebody lackadaisical is behaving as if perpetually sighing.
1adjectivelackadaisicalDoing things without energy or care.
“The team's lackadaisical defending cost them two easy goals.”
lackadaisical is a quality.
From lackadaisy, an extension of the old exclamation lackaday, a sigh of regret.
From the archaic expression lackadaisy + -ic + -al.
Etymology from Wiktionary, CC BY-SA