| Sentences of lackadaisical|
a. lacking purpose or zest; halfhearted; lacking spirit or liveliness
Because Gatsby had his mind more on his love life than on his finances, he did a very lackadaisical job of managing his money.
Sentence in Classic:
There is no doubt whatever that I was a lackadaisical young spooney; but there was a purity of heart in all this, that prevents my having quite a contemptuous recollection of it, let me laugh as I may.
David Copperfield By Charles Dickens Context