overactive

adjective

over·​ac·​tive ˌō-vər-ˈak-tiv How to pronounce overactive (audio)
: excessively or abnormally active
overactive glands
an overactive imagination
overactivity noun

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 good news is that drugs that try to calm down an overactive complement system are already on the market and in development for other conditions. Lisa Jarvis, Twin Cities, 28 Jan. 2024 Anandamide plays a number of roles throughout the body, including sensory and pain modulation, and increased levels are expected to desensitize overactive sensory neurons in the upper airways of chronic cough patients, limiting the urge to cough. Miami Herald, 25 Jan. 2024 As a child with an overactive imagination who struggled to stay organized and to wait her turn, Edwards had a hard time learning as her classmates did. Angela Roberts, Hartford Courant, 13 Jan. 2024 The vagus nerve quiets this overactive defense by reducing the production of cytokines, signaling chemicals that promote inflammation. Shi En Kim, Scientific American, 28 Dec. 2023 Alternatively, healthy cells can order overactive or damaged neighbor cells to activate their executioner proteins. Zoie Magri, The Conversation, 4 Oct. 2023 But not all chats are welcome, and an overactive chat can be distracting. Danielle Abril, Washington Post, 4 Dec. 2023 In the early two-thousands, Nvidia shipped a faulty graphics card with a loud, overactive fan. Stephen Witt, The New Yorker, 27 Nov. 2023 Those symptoms might signal an overactive thyroid (hyperthyroidism).13 When To Seek Immediate Medical Attention Exercising outdoors in hot temperatures increases your risk of heat illness. Amanda MacMillan, Health, 25 Nov. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'overactive.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1647, in the meaning defined above

Time Traveler
The first known use of overactive was in 1647

Dictionary Entries Near overactive

Cite this Entry

“Overactive.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/overactive. Accessed 27 Feb. 2024.

Kids Definition

overactive

adjective
over·​ac·​tive ˌō-və-ˈrak-tiv How to pronounce overactive (audio)
: very active and especially abnormally so
an overactive thyroid
overactivity noun

Medical Definition

overactive

adjective
over·​ac·​tive ˌō-və-ˈrak-tiv How to pronounce overactive (audio)
: excessively or abnormally active
an overactive mind
overactive glands
overactivity noun
plural overactivities

More from Merriam-Webster on overactive

Last Updated: - Updated example sentences
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