Lackadazed
you're so unfocused you can't even notice your own mistakes, and you're too lazy to do anything about it.
"You're lackadazed and still think you passed the test.", my friend, after I failed mine.
"He's lackadazed and still thinks he's the best dancer in the school.", my brother, after he tripped during the talent show.
"I'm lackadazed and still arguing about whether it's morning or night.", me, after I stayed up too late.