I'm debating on whether or not you googled what lackadaisical ment, but for the sake of my sanity, I'll just assume you're intelligent enough to understand this word.
That word is essential to know though, because it sounds funny.
Plus I had it wrong in my head for years till I found out it isn't "lacksadaisical" with that extra "s" in there, so I never remember how to spell it now which makes it funnier.