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
The cause of the condition is often unknown, but in the majority of cases it's linked to an overactive immune system.
—
Zia Sherrell, Health, 17 Feb. 2026
Renal denervation is a minimally invasive therapy that reduces overactive sympathetic nerve activity around the renal arteries.
—Memorialcare, Oc Register, 16 Feb. 2026
Choosing a supplement Bladder control supplements are considered a complementary overactive bladder treatment, which means they are taken in combo with other treatments, including prescription medication, diet and exercise changes and pelvic floor strengthening exercises.
—Bestreviews, Chicago Tribune, 11 Feb. 2026
Instead, it’s caused by an overactive immune system.
—Refinery29 Staff, Refinery29, 3 Feb. 2026
See All Example Sentences for overactive
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Zia Sherrell, Health, 17 Feb. 2026
Renal denervation is a minimally invasive therapy that reduces overactive sympathetic nerve activity around the renal arteries.
—Memorialcare, Oc Register, 16 Feb. 2026
Choosing a supplement Bladder control supplements are considered a complementary overactive bladder treatment, which means they are taken in combo with other treatments, including prescription medication, diet and exercise changes and pelvic floor strengthening exercises.
—Bestreviews, Chicago Tribune, 11 Feb. 2026
Instead, it’s caused by an overactive immune system.
—Refinery29 Staff, Refinery29, 3 Feb. 2026
See All Example Sentences for overactive
Cite this Entry
“Overactive.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/overactive. Accessed 25 Feb. 2026.
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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