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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.

Based on a physical examination, other symptoms and medical history, the health practitioner suspects that the patient could be suffering from any of the following: anemia, an underactive thyroid or diabetes.

From Salon • Feb. 7, 2024

Of oral drugs to treat underactive thyroid, 66 percent contain lactose.

From Washington Post • Oct. 7, 2022

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

A further theory is that it may be caused by an underactive immune system or one sent into freefall by the original virus.

From BBC • Jul. 12, 2021

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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