The Collaborative International Dictionary of English v.0.48:

Lackadaisy \Lack"a*dai`sy\, interj. [From Lackaday, interj.]
   An expression of languor.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lackadaisy \Lack"a*dai`sy\, a.
   Lackadaisical.
   [1913 Webster]