Neighbor boy who is 10 with ADHD?

I think you have to remind yourself this child is suffering from a disability and try to be a bit more patient. It does sound he is suffering from more than ADHD. Sure he doesn't understand the ramifications of his actions, but you should always try to present yourself as a responsible adult. When he is annoying you just say "Sorry but I am too busy, too tired, etc. to talk with you today ... I have come out here today because I want to be quiet and I don't feel well." Why not try to find an occasion once in a while to genuinely offer a compliment when he actually does something good or responsible. That would be more beneficial to him (and yourself) in the long run. You could always give him something simple to play with ... a paintbrush to use with water so he can draw all over the driveway in a harmless fashion may keep him occupied for a time. Your son simply has to say "I don't want to play with you" and walk away. There used to be a saying "little children, little problems." Why not count your blessings your child has not been affected by disability; ever considered how difficult it must be for his parents?