Attention Deficit Disorder Without Hyperactivity (ADD) in Adults. Attention deficit hyperactivity disorder (AD/HD) is a common psychological disorder that is characterized by problems with attention, impulsivity and/or hyperactivity. What is attention deficit disorder without. Many adults have ADHD without ever being diagnosed. It's important to recognize the signs so you can get proper treatment. Keep reading to Untreated emotional problems can add complications to personal and professional relationships.