• Webster's Revised Unabridged Dictionary
    • interj Lackadaisy An expression of languor.
    • a Lackadaisy Lackadaisical.
    • ***
Century Dictionary and Cyclopedia
    • lackadaisy A ludicrous extension of lackaday.
    • lackadaisy Same as lackadaisical.
    • ***
Chambers's Twentieth Century Dictionary
    • interj Lackadaisy Lack-a-day
    • ***


Webster's Revised Unabridged Dictionary
From Lackaday interj,
Chambers's Twentieth Century Dictionary
Alack-a-day. See Alack.


In literature:

Gushingly he does his work, but thoroughly; and there are other flowers than lackadaisies to be discerned in his herbage.
"Punchinello, Vol. 1, No. 5, April 30, 1870" by Various