underactive
adjective
un·der·ac·tive
ˌən-dər-ˈak-tiv 
: characterized by an abnormally low level of activity
an underactive thyroid gland
Examples of underactive in a Sentence
Recent Examples on the Web
Hypothyroidism is an underactive thyroid gland, and hyperthyroidism is an overactive thyroid gland.
—
Colleen Doherty, Verywell Health, 12 May 2025
According to the National Institute of Diabetes and Digestive and Kidney Diseases, Hashimoto's disease is an autoimmune disorder that can cause hypothyroidism, or an underactive thyroid.
—EW.com, 9 May 2025
Phytochemicals can help support balanced immune function (neither underactive nor overactive).
—Heather Jones, Verywell Health, 21 Feb. 2025
Hypothyroidism, or underactive thyroid, occurs when the thyroid gland doesn't produce enough hormones.
—Merve Ceylan, Health, 25 Jan. 2025
See All Example Sentences for underactive
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Colleen Doherty, Verywell Health, 12 May 2025
According to the National Institute of Diabetes and Digestive and Kidney Diseases, Hashimoto's disease is an autoimmune disorder that can cause hypothyroidism, or an underactive thyroid.
—EW.com, 9 May 2025
Phytochemicals can help support balanced immune function (neither underactive nor overactive).
—Heather Jones, Verywell Health, 21 Feb. 2025
Hypothyroidism, or underactive thyroid, occurs when the thyroid gland doesn't produce enough hormones.
—Merve Ceylan, Health, 25 Jan. 2025
See All Example Sentences for underactive
Cite this Entry
“Underactive.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underactive. Accessed 24 May. 2025.
Copy CitationKids Definition
underactive
adjective
un·der·ac·tive
ˌən-də-ˈrak-tiv
: having an abnormally low level of activity
an underactive gland
Medical Definition
underactive
adjective
un·der·ac·tive
-ˈak-tiv
: characterized by an abnormally low level of activity
an underactive thyroid gland
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