Signs of inattention in ADHD include significant difficulty with tasks requiring prolonged focus, such as conversations or reading, and a tendency to avoid them. Individuals may fail to follow instructions, leading to incomplete schoolwork or other duties. Disorganization is also common, manifesting as poor time management, messy work, and trouble keeping things in order. Other key symptoms are a lack of attention to detail, being easily distracted by external stimuli, and frequent forgetfulness.