- The definition of lackadaisical is someone lacking spirit or interest.
An example of someone who would be described as lackadaisical is a person who makes a disinterested and half-hearted attempt at his schoolwork.
Origin: from lackadaisy, altered (infl. by daisy) from lackaday
- lackadaisically adverb
Used by arrangement with John Wiley & Sons, Inc.
Origin: From lackadaisy, alteration of lackaday.
- lackˌa·daiˈsi·cal·ly adverb
- lackˌa·daiˈsi·cal·ness noun