from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Lacking spirit, liveliness, or interest; languid.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Showing no interest or enthusiasm.

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

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


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

[From lackadaisy, alteration of lackaday.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the archaic interjection lackaday, lackadaisy.


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

    December 15, 2006

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

    October 30, 2007

  • "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

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

    December 7, 2009