a. [ From Lackadaisy, interj. ] 1. Affectedly pensive; languidly sentimental; dreamy. [ 1913 Webster ]
2. Lacking spirit or liveliness; lethargic; listless; languid. [ PJC ]
3. Indolent; lazy; idle, especially in a dreamy manner. [ PJC ]
-- Lack`a*dai"si*cal*ly, adv. [1913 Webster]