untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd How to pronounce untreated (audio)
Synonyms of untreatednext
: not treated
untreated wastewater
especially : not improved or controlled medically
an untreated case of pneumonia
untreated diabetic patients

Synonyms of untreated

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Examples of untreated in a Sentence

untreated wool
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Investigators said he was found with an untreated gunshot wound to the chest from the night of the shooting. — Nicole Alarcon, CBS News, 15 Oct. 2026 Pelvic pain and trouble peeing are disruptive, but UTIs are dangerous if left untreated — delays in care are all too common and make prolonged suffering and dangerous complications more likely. — Helen Carefoot, Flow Space, 14 Oct. 2026 Dementia related to untreated syphilis left him incapable of resuming his position atop the country’s criminal underworld. — Encyclopedia Britannica, 14 Oct. 2026 Those delays matter, because untreated inflammation from autoimmune disease can cause lasting damage to organs and is linked to poorer quality of life and a shorter lifespan. — Emily Kay Votruba, EverydayHealth.com, 13 Oct. 2026 See All Example Sentences for untreated

Word History

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of untreated was in the 15th century

Rhymes for untreated

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Browse Nearby Words

untreatable
untreated
untremulous
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Cite this Entry

“Untreated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/untreated. Accessed 19 Oct. 2026.

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Medical Definition

untreated

adjective
un·​treat·​ed -ˈtrēt-əd How to pronounce untreated (audio)
: not subjected to treatment
an untreated disease
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