People with inattentive ADHD are not lazy, stupid, unwilling, or oppositional. They have a biologically based challenge with attending to the task at hand, and their brains tire more quickly. People with inattentive type ADHD (formerly called ADD) struggle with managing time, losing or misplacing things, and attending to details (resulting in careless mistakes), among other symptoms.
Over time, these individuals may experience a higher level of mental fatigue and forgetfulness, and lower sustained energy throughout a task than do their non-ADHD peers. Difficulty completing tasks, a lack of clarity on what to do, or a preoccupation with something else are common challenges for people with inattentive ADHD