Mental or Behavioral Dysfunction
hyperactivity Audio
hy·per·ac·tiv·i·ty [ hahy-per-ak-tiv-i-tee ]
Definitions related to hyperactive behavior:
  • (hyperactivity) A higher than normal level of activity. Hyperactivity can be used to describe the increased action of a body function, such as hormone production, or behavior. A person who is hyperactive may seem to be always moving or fidgeting, impulsive, unable to concentrate, and talking too much.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • (hyperactivity) Hyperactivity is a condition characterized by constant and unusually high levels of activity, even in situations where it is deemed inappropriate.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2025
  • (hyperactivity) Increased motor activity that is not goal directed.
    NCI
    U.S. National Cancer Institute, 2021
  • (hyperactivity) Increased muscular activity. The term is commonly used to describe a disturbance found in children that is manifested by constant restlessness, overactivity, distractibility and difficulties in learning. Seen in attention-deficit/hyperactivity disorder (ADHD).
    Sadock's Comprehensive Glossary of Psychiatry and Psychology
    BJ Sadock Titles Press, 2012
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