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
Since blemishes are closely tied to overactive oil glands, using a mask with these clays helps reduce one of the main triggers of acne.
—
Christa Joanna Lee, Allure, 30 Sep. 2025
These dietary patterns appear to calm overactive immune responses and improve cellular repair processes.
—William A. Haseltine, Forbes.com, 16 Sep. 2025
Restoring brain glucose levels calmed the overactive CCK interneurons, in turn regulating the function of those excitatory pyramidal neurons, and the short-term memory problems seen in the mice were resolved.
—New Atlas, 11 Sep. 2025
Despite the mess in her apartment, the man, like everyone else in her life, brushes off her fears as the exaggerations of an overactive imagination.
—Marya E. Gates, IndieWire, 9 Sep. 2025
See All Example Sentences for overactive
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Christa Joanna Lee, Allure, 30 Sep. 2025
These dietary patterns appear to calm overactive immune responses and improve cellular repair processes.
—William A. Haseltine, Forbes.com, 16 Sep. 2025
Restoring brain glucose levels calmed the overactive CCK interneurons, in turn regulating the function of those excitatory pyramidal neurons, and the short-term memory problems seen in the mice were resolved.
—New Atlas, 11 Sep. 2025
Despite the mess in her apartment, the man, like everyone else in her life, brushes off her fears as the exaggerations of an overactive imagination.
—Marya E. Gates, IndieWire, 9 Sep. 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 4 Oct. 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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