overactive
Americanadjective
adjective
-
inordinately active
-
(of the thyroid or adrenal gland, nervous system, etc) functioning at too high a capacity
Other Word Forms
Etymology
Origin of overactive
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Relaxing travel activities may also help reduce chronic stress and calm an overactive immune response.
From Science Daily ● May 4, 2026
Researchers are probing the pill’s efficacy in patients with Type 2 inflammatory diseases, which are triggered by an overactive immune response.
From Barron's ● Dec. 8, 2025
“I have a prescription for an overactive bladder.”
From The Wall Street Journal ● Oct. 17, 2025
She credits what her father jokes is “an overactive sense of justice” to her grandparents, who ran a corner store in Santa Ana in the 1940s.
From Los Angeles Times ● Oct. 15, 2025
"And why were you wasting precious time listening to an overaged delivery boy with an overactive imagination when you should have been studying."
From "The Westing Game" by Ellen Raskin
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
