Dictionary.com
Thesaurus.com

underactive

American  
[uhn-der-ak-tiv] / ˌʌn dərˈæk tɪv /

adjective

  1. insufficiently active.

    an underactive thyroid gland.


underactive British  
/ ˌʌndərˈæktɪv /

adjective

  1. (of the thyroid or adrenal glands) not functioning at full capacity

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of underactive

First recorded in 1955–60; under- + active

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.

See Examples For:

Laura is 41 and has Down's syndrome, asthma and an underactive thyroid.

From BBC ● Dec. 20, 2023

Some attributed her symptoms to menopause; others said her thyroid was malfunctioning and prescribed varying amounts of medication to treat fluctuating episodes of underactive or overactive thyroid, which can occur when the gland is inflamed.

From Seattle Times ● Oct. 16, 2021

Although people often associate underactive — longer and overstretched — muscles with urinary incontinence, experts emphasized that the overactive muscles, which are also weak and not coordinated, could be to blame.

From Washington Post ● Aug. 18, 2021

In another instance, the records that accompanied deBronkart’s mother to a rehabilitation center after a hip replacement incorrectly identified her as having an underactive thyroid when in fact she had an overactive thyroid.

From Salon ● Nov. 25, 2018

Conversely, in hypercalcemia, a condition characterized by abnormally high levels of calcium, the nervous system is underactive, which results in lethargy, sluggish reflexes, constipation and loss of appetite, confusion, and in severe cases, coma.

From Textbooks ● Jun. 19, 2013

Vocabulary.com logo
by dictionary.com

Look it up. Learn it forever.

Remember new words for good with VocabTrainer. Expand your vocabulary effortlessly with personalized learning tools that adapt to your goals.

Take me to Vocabulary.com