hy·​per·​ac·​tiv·​i·​ty | \ ˌhī-pər-ˌak-ˈti-və-tē How to pronounce hyperactivity (audio) \

Definition of hyperactivity

1 : the state or condition of being overly active Canada geese are disarmingly expressive. … They disdain the frantic hyperactivity of smaller birds.— Benjamin B. Bachman
2 : increased levels of function or activity especially when considered abnormally excessive She had developed delusions of invincibility, along with bouts of hyperactivity and severe insomnia.— Per Ola and Emily D'Aulaire especially : higher than usual levels of movement and activity (such as excessive talking or fidgeting) typically associated with attention deficit disorder An estimated 1 in 50 school-age children in the United States, receive stimulant medication to help quell inattentiveness and hyperactivity. — Christine Mlot

Examples of hyperactivity in a Sentence

Recent Examples on the Web More broadly, the hyperactivity of today’s news cycle, the explosion of media outlets and the fleeting attention span of voters have changed the nature of politics and lessened the impact of an event like Jackson’s inquisition. Mark Z. Barabakcolumnist, Los Angeles Times, 31 Mar. 2022 During brain development, these cells migrate to the hippocampus and become inhibitory neurons, which counteract hyperactivity in the brain, maintaining a delicate balance of electrical activity. Emily Mullin, Science, 5 Jan. 2022 The toxin is also linked to speech and developmental delays, hearing loss and hyperactivity. courant.com, 23 Mar. 2022 But relatives previously told media that the teenager was born with fetal alcohol syndrome, which can be associated with lifelong neurological impairments including impulsiveness, hyperactivity and poor judgment. Washington Post, 6 Feb. 2022 Lead poisoning in children can cause behavior and learning problems, lower IQ and hyperactivity, slower growth, hearing problems, and anemia, according to the U.S. EPA. Jeremy Pelzer, cleveland, 7 Mar. 2022 In a study committee, DPH reported that low levels of lead in children can cause declines in IQ, hyperactivity and social withdrawal. Ariel Hart, ajc, 9 Feb. 2022 If your son is diagnosed with a learning challenge or attention-deficit/hyperactivity disorder, that would explain why school, in all of its forms, has been unsuccessful. Washington Post, 17 Mar. 2022 Negative health effects of drinking water with a lead presence include behavioral issues, a lower IQ, hyperactivity, slowed growth, anemia, cardiovascular effects, decreased kidney function and reproductive problems. Tori B. Powell, CBS News, 11 Nov. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hyperactivity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of hyperactivity

1888, in the meaning defined at sense 1

Learn More About hyperactivity

Time Traveler for hyperactivity

Time Traveler

The first known use of hyperactivity was in 1888

See more words from the same year

Dictionary Entries Near hyperactivity




See More Nearby Entries 

Statistics for hyperactivity

Last Updated

1 May 2022

Cite this Entry

“Hyperactivity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hyperactivity. Accessed 20 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for hyperactivity


hy·​per·​ac·​tiv·​i·​ty | \ ˌhī-pə-ˌrak-ˈtiv-ət-ē How to pronounce hyperactivity (audio) \
plural hyperactivities

Medical Definition of hyperactivity

: a state or condition of being excessively or pathologically active especially : attention deficit disorder

More from Merriam-Webster on hyperactivity

Nglish: Translation of hyperactivity for Spanish Speakers

Britannica.com: Encyclopedia article about hyperactivity


Test Your Vocabulary

Which Word Does Not Belong?

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!