hy·​per·​ac·​tiv·​i·​ty | \ ˌhī-pər-ˌak-ˈti-və-tē \

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

Cruz’s mother, who has since died of pneumonia, also told authorities the teen was diagnosed with obsessive compulsive disorder, autism and attention deficit-hyperactivity disorder. Erika Pesantes, Sun-Sentinel.com, "Family of Helena Ramsay asks judge for Parkland shooter's mental health records," 15 June 2018 When Gillian was 8 years old, her hyperactivity — which earned her the nickname Wriggle-Bottom — led her mother to take her to a family doctor. Richard Sandomir, BostonGlobe.com, "Gillian Lynne, 92, choreographer of ‘Cats’," 8 July 2018 When Gillian was 8 years old, her hyperactivity — which earned her the nickname Wriggle-Bottom — led her mother to take her to a family doctor. Richard Sandomir, New York Times, "Gillian Lynne, Choreographer of ‘Cats,’ Is Dead at 92," 2 July 2018 But squeezed by the same forces, all military branches must sweeten their enlistment deals, adding sign-up and retention bonuses and loosening medical standards on childhood conditions like asthma and attention-deficit/hyperactivity disorder. Dave Philipps, The Seattle Times, "The Army, in need of recruits, turns focus to Seattle, other liberal-leaning cities," 2 Jan. 2019 There could be depression or attention-deficit hyperactivity disorder in the child. Betsy Morris, WSJ, "How Fortnite Triggered an Unwinnable War Between Parents and Their Boys," 21 Dec. 2018 These include dementia, anxiety, post-traumatic stress disorder, obsessive-compulsive disorder, attention-deficit/hyperactivity disorder, and eating disorders, according to the NIMH. 7. Carolyn L. Todd, SELF, "9 Things You Should Know About Taking Antipsychotic Drugs," 7 Dec. 2018 The more teens use social-media networking sites, video games and streaming services, the higher their risk of developing symptoms of attention-deficit hyperactivity disorder, or ADHD, a new study found. Betsy Morris, WSJ, "Frequent Technology Use Linked to ADHD Symptoms in Teens, Study Finds," 17 July 2018 Simone Biles, the number one gymnast in the world, has attention-deficit/hyperactivity disorder (ADHD). Ola Ojewumi, SELF, "I'm Celebrating My Disabled Black Girl Magic Because I'm Done Feeling Invisible," 7 Nov. 2018

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.

See More

First Known Use of hyperactivity

1888, in the meaning defined at sense 1

Keep scrolling for more

Learn More about hyperactivity

Share hyperactivity

Statistics for hyperactivity

Last Updated

8 Feb 2019

Look-up Popularity

Time Traveler for hyperactivity

The first known use of hyperactivity was in 1888

See more words from the same year

Keep scrolling for more

More Definitions for hyperactivity


hy·​per·​ac·​tiv·​i·​ty | \ ˌhī-pə-ˌrak-ˈtiv-ət-ē \
plural hyperactivities

Medical Definition of hyperactivity

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

Keep scrolling for more

More from Merriam-Webster on hyperactivity

Rhyming Dictionary: Words that rhyme with hyperactivity

Spanish Central: Translation of hyperactivity

Nglish: Translation of hyperactivity for Spanish Speakers

Britannica.com: Encyclopedia article about hyperactivity

Comments on hyperactivity

What made you want to look up hyperactivity? Please tell us where you read or heard it (including the quote, if possible).


marked by fawning attentiveness

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

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