Webster's Revised Unabridged Dictionary · 1913

lackadaisical

lackadaisical (lak`ȧ*dā"zi*kal) , adjective

[From Lackadaisy, interj.]

1.
Affectedly pensive; languidly sentimental; dreamy.
2.
Lacking spirit or liveliness; lethargic; listless; languid.
3.
Indolent; lazy; idle, especially in a dreamy manner.