Which of the following is NOT a common symptom of ADHD?

Excessive calmness is not a common symptom of ADHD. Individuals with ADHD typically display symptoms that include impulsivity, hyperactivity, and inattention. These features are well-documented in the diagnostic criteria for ADHD.

Impulsivity refers to acting without thinking about the consequences, often leading to hasty decisions or actions. Hyperactivity is characterized by excessive movement and difficulty remaining still, particularly in situations where quietness is expected. Inattention involves difficulty sustaining attention, following through on tasks, and organizing activities.

In contrast, excessive calmness does not reflect the behavioral patterns associated with ADHD and can actually indicate an absence of symptoms rather than their presence. This choice stands out distinctly as it does not align with the diagnostic profile of ADHD and helps in distinguishing ADHD symptoms from other behaviors that might occur in different contexts.