from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Lacking spirit, liveliness, or interest; languid: "There'll be no time to correct lackadaisical driving techniques after trouble develops” ( William J. Hampton).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Showing no interest or enthusiasm.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • Sentimentally woebegone; languid; listless; affected. See extract under lackthought.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. lacking spirit or liveliness
  • adj. idle or indolent especially in a dreamy way


From lackadaisy, alteration of lackaday.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the archaic interjection lackaday, lackadaisy. (Wiktionary)



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  • It's really too bad that people show a lackadaisical approach to spelling when they say 'lacksadaisical.' Know that I mean?

    December 7, 2009

  • "I have no recollection of the last twenty-four hours," said Tom lackadaisically.

    "Miss Buchanan sends her regrets that she will not be able to join us for dinner', said Nick lackadaisically.

    October 30, 2007

  • what a great word - thanks for sharing. Thinking hard to find an opportunity to use it...

    October 30, 2007

  • just learned that this word is from the interjection 'lack-a-daisy' and 'spozed to mean 'vapidly sentimental'; interesting...

    December 15, 2006