Completely unreliable, unmotivated, only does the minimum amount of work to not be fired and often not even that.
Can't communicate, can't cope without their cell phones, have no concept of professional behavior.
I could keep going...
We just started getting those in right before I left work. I probably would have lost it if I'd stayed longer and had to put up with them.
On my way out, I was training a PhD student interning with us on some of the maritime surveillance stuff I had set up. Dude would consistently be late for meetings with me, yawn and let his eyes wander when I was going over tech stuff, and when I briefed him on behavior and attire for going to a Navy installation where I had some of my equipment set up, the next morning he showed up at the boat in a t-shirt, sweats, and tennis shoes and couldn't understand why I was mad at him.
I spent a good two months after I separated taking calls and emails from his boss on, "How do we do...?" which I of course went over in detail with the kid and also wrote a *expletive deleted*ing manual for.
Everything I read says that this is very normal - that younger employees, even when skilled, simply have a lackadaisical attitude towards anything that might be considered standards or procedure. They will work, but on their terms. It used to be that you had to put in a good ten years and rise in the ranks some before you copped attitudes like that.