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Definitions

hyperactivity

[hahy-per-ak-tiv-i-tee] / ˌhaɪ pər ækˈtɪv ɪ ti /
NOUN
attention deficit disorder
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Strong clinical evidence supports melatonin's short term benefits for children with neurodevelopmental disorders such as autism and attention deficit hyperactivity disorder.

From Science Daily • Mar. 15, 2026

Children also are on screens more than ever, which is believed to contribute to more anxiety, depression, aggression and hyperactivity.

From Los Angeles Times • Feb. 17, 2026

It was at least the fourth time in less than a year that then 8-year-old Trent Davis, who has autism and attention-deficit hyperactivity disorder, had run away from home, police reports show.

From The Wall Street Journal • Nov. 18, 2025

When Joani Reisen goes without her medicine for attention-deficit hyperactivity disorder, she says it feels like “squirrels running everywhere” in her mind.

From MarketWatch • Oct. 21, 2025

These so-called comorbidities—meaning the conditions co-occur with Internet addiction—include “attention-deficit hyperactivity, mood, anxiety and personality disorders.”

From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel