overactive
adjective
over·ac·tive
ˌō-vər-ˈak-tiv 
: excessively or abnormally active
overactive glands
an overactive imagination
Examples of overactive in a Sentence
She has an overactive bladder.
His crazy ideas are products of an overactive imagination.
Recent Examples on the Web
This overactive immune response can cause inflammation and mistakenly attack joint tissues, leading to pain, swelling, and stiffness.
—
Lindsay Curtis, Health, 2 Aug. 2025
Not to mention, these powerful SCFAs can also spur gut cells to pump out serotonin and activate your parasympathetic (a.k.a. rest and digest) nervous system, which may calm down an overactive stress response.
—Erica Sloan, SELF, 25 July 2025
These medications treat chronic obstructive pulmonary disease (COPD) and an overactive bladder.
—Carrie Madormo, Verywell Health, 10 July 2025
Using mice that had the genetic mutation that causes overactive LRRK2 and also had symptoms consistent with early Parkinson’s disease, the scientists tried feeding them the inhibitor for two weeks.
—Khloe Quill, FOXNews.com, 7 July 2025
See All Example Sentences for overactive
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Lindsay Curtis, Health, 2 Aug. 2025
Not to mention, these powerful SCFAs can also spur gut cells to pump out serotonin and activate your parasympathetic (a.k.a. rest and digest) nervous system, which may calm down an overactive stress response.
—Erica Sloan, SELF, 25 July 2025
These medications treat chronic obstructive pulmonary disease (COPD) and an overactive bladder.
—Carrie Madormo, Verywell Health, 10 July 2025
Using mice that had the genetic mutation that causes overactive LRRK2 and also had symptoms consistent with early Parkinson’s disease, the scientists tried feeding them the inhibitor for two weeks.
—Khloe Quill, FOXNews.com, 7 July 2025
See All Example Sentences for overactive
Cite this Entry
“Overactive.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/overactive. Accessed 19 Aug. 2025.
Copy CitationKids Definition
overactive
adjective
over·ac·tive
ˌō-və-ˈrak-tiv
: very active and especially abnormally so
an overactive thyroid
Medical Definition
overactive
adjective
over·ac·tive
ˌō-və-ˈrak-tiv
: excessively or abnormally active
an overactive mind
overactive glands
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