A co-worker and I were conversing just the other day and she dropped the word 'lackadaisical' in a sentence. I thought to self: 'Wow!!! That is a word that I would love to put in my vocabulary.' So, I've been thinking and thinking of how I would casually throw it into a conversation...
without interest, vigor, or determination; listless; lethargic: a lackadaisical attempt.
lazy; indolent: a lackadaisical fellow.