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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.

Darren said that by the age of six or seven, changes in Sophia's behaviour had become more noticeable, including hyperactivity and mood swings.

From BBC • Mar. 31, 2026

Most of his teachers were ill-equipped to handle his behavioral problems, later diagnosed as attention-deficit hyperactivity disorder and obsessive-compulsive disorder.

From The Wall Street Journal • Mar. 1, 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

Synthetic dyes are often added to make foods look more appealing, especially products aimed at children, but a growing body of evidence indicates they may contribute to behavioral problems such as hyperactivity and inattention.¹

From Science Daily • Nov. 7, 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