noun
hyperactivity (in children); hyperkinesis
Medical term for excessive motor activity, often used in the context of ADHD or similar conditions in children.
多動症の子どもは、じっと座っているのが難しいことが多い。
Children with hyperactivity often find it difficult to sit still.
Compound of 多 (many, excessive), 動 (movement), and 症 (symptom, condition).