hyperactivity
noun
hy·per·ac·tiv·i·ty
ˌhī-pər-ˌak-ˈti-və-tē 
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
Benjamin B. Bachman2
: 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
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 hyperactivity disorder
An estimated 1 in 50 school-age children in the United States, receive stimulant medication to help quell inattentiveness and hyperactivity. —Christine Mlot
Christine Mlot Examples of hyperactivity in a Sentence
Recent Examples on the Web
Some avoid anxiety by ‘emotional distancing’ Stephanie Sarkis, a psychotherapist specializing in attention-deficit/hyperactivity disorder and anxiety, says emotional desensitization can happen after prolonged exposure to stress.
—Alyssa Goldberg, USA Today, 12 May 2026
Children are also on screens now more than ever, which is believed to contribute to more anxiety, depression, aggression and hyperactivity.
—Stacker, Hartford Courant, 9 May 2026
On Thursday, Kazmierczak told Ericksen that he was being treated for Parkinson’s disease, and that he’d been diagnosed with ADHD, or attention-deficit/hyperactivity disorder, and a form of post-traumatic stress.
—Tim Sullivan, Los Angeles Times, 8 May 2026
On Thursday, Kazmierczak told Erickson that he was being treated for Parkinson’s disease, and that he’d been diagnosed with ADHD or attention-deficit/hyperactivity disorder, and a form of post-traumatic stress.
—ABC News, 7 May 2026
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Alyssa Goldberg, USA Today, 12 May 2026
Children are also on screens now more than ever, which is believed to contribute to more anxiety, depression, aggression and hyperactivity.
—Stacker, Hartford Courant, 9 May 2026
On Thursday, Kazmierczak told Ericksen that he was being treated for Parkinson’s disease, and that he’d been diagnosed with ADHD, or attention-deficit/hyperactivity disorder, and a form of post-traumatic stress.
—Tim Sullivan, Los Angeles Times, 8 May 2026
On Thursday, Kazmierczak told Erickson that he was being treated for Parkinson’s disease, and that he’d been diagnosed with ADHD or attention-deficit/hyperactivity disorder, and a form of post-traumatic stress.
—ABC News, 7 May 2026
See All Example Sentences for hyperactivity
Cite this Entry
“Hyperactivity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hyperactivity. Accessed 14 May. 2026.
Copy CitationMedical Definition
hyperactivity
noun
hy·per·ac·tiv·i·ty
ˌhī-pə-ˌrak-ˈtiv-ət-ē
plural hyperactivities
: a state or condition of being excessively or pathologically active
especially
: attention deficit hyperactivity disorder
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