overactive
adjective
over·ac·tive
ËŒÅ-vÉ™r-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
How heat affects pigmentation Melasma is caused by overactive pigment-producing cells called melanocytes.
—
Leslie Baumann, Miami Herald, 20 Mar. 2026
There are reasons to believe CAR-T therapy may be able to target the same overactive B cells that current multiple sclerosis drugs already do.
—Kaitlin Sullivan, NBC news, 15 Mar. 2026
Where Co-Existing Conditions Come In There are also skin conditions that affect Black women at higher rates, including melasma, which can cause discoloration from overactive pigment cells.
—Iyana Robertson, Flow Space, 10 Mar. 2026
Koy, the son of a white father and Filipina mother, saw comedy as a way to channel an overactive personality and need to make people laugh into a career.
—Deputy Entertainment, Los Angeles Times, 5 Mar. 2026
See All Example Sentences for overactive
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Leslie Baumann, Miami Herald, 20 Mar. 2026
There are reasons to believe CAR-T therapy may be able to target the same overactive B cells that current multiple sclerosis drugs already do.
—Kaitlin Sullivan, NBC news, 15 Mar. 2026
Where Co-Existing Conditions Come In There are also skin conditions that affect Black women at higher rates, including melasma, which can cause discoloration from overactive pigment cells.
—Iyana Robertson, Flow Space, 10 Mar. 2026
Koy, the son of a white father and Filipina mother, saw comedy as a way to channel an overactive personality and need to make people laugh into a career.
—Deputy Entertainment, Los Angeles Times, 5 Mar. 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 28 Mar. 2026.
Copy CitationKids Definition
overactive
adjective
over·ac·tive
ËŒÅ-vÉ™-ˈrak-tiv
: very active and especially abnormally so
an overactive thyroid
Medical Definition
overactive
adjective
over·ac·tive
ËŒÅ-vÉ™-ˈrak-tiv
: excessively or abnormally active
an overactive mind
overactive glands
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