I worked in a different school district last year with kids one on one (reading) and I had a few where it seemed obvious they had ADHD. The teachers seemed very resistant to talking to the parents about it, and that was my experience as well with my own kid in a different school. One teacher actually told me what I said above...they can hint by using words like "unfocused", but they can't come right out and suggest ADHD. I think there are tons of kids that actually do have it and they are never diagnosed (and of course there are kids who do not have it, but are diagnosed, or worse yet, put on meds). It takes a thorough eval and if there are any concerns at all about focus or attention, I suggest parents take the child in for a private eval.
