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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.

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

From BBC • Dec. 20, 2023

Warren takes medication for hypothyroidism, a common condition in which the thyroid gland is underactive, according to the letter.

From Washington Post • Dec. 5, 2019

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

The condition causes the bladder to become overactive or underactive.

From Seattle Times • Jun. 5, 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

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