untreated
adjective
un·treat·ed
ˌən-ˈtrē-təd 
: not treated
untreated wastewater
especially
: not improved or controlled medically
an untreated case of pneumonia
untreated diabetic patients
Examples of untreated in a Sentence
untreated wool
Recent Examples on the Web
Millions of gallons of untreated wastewater flow daily from Mexico’s Tijuana River across the border into the United States, contaminating beaches near Imperial Beach and exposing nearby communities to toxic gases including hydrogen sulfide.
—
Walker Armstrong, San Diego Union-Tribune, 6 Feb. 2026
Maternal syphilis rates rose 28% from 2022 to 2024, and untreated infection during pregnancy can cause serious harm or death to a baby.
—wendy Wisner, Parents, 4 Feb. 2026
Many of the other dogs showed signs consistent with long-term outdoor neglect, including parasites, dental issues, and untreated medical conditions such as Giardia, fleas, and ticks.
—Moná Thomas, PEOPLE, 4 Feb. 2026
Be prepared for slick spots overnight into Thursday morning, especially on untreated roadways.
—Nc Weather Bot, Charlotte Observer, 4 Feb. 2026
See All Example Sentences for untreated
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Walker Armstrong, San Diego Union-Tribune, 6 Feb. 2026
Maternal syphilis rates rose 28% from 2022 to 2024, and untreated infection during pregnancy can cause serious harm or death to a baby.
—wendy Wisner, Parents, 4 Feb. 2026
Many of the other dogs showed signs consistent with long-term outdoor neglect, including parasites, dental issues, and untreated medical conditions such as Giardia, fleas, and ticks.
—Moná Thomas, PEOPLE, 4 Feb. 2026
Be prepared for slick spots overnight into Thursday morning, especially on untreated roadways.
—Nc Weather Bot, Charlotte Observer, 4 Feb. 2026
See All Example Sentences for untreated
Cite this Entry
“Untreated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/untreated. Accessed 15 Feb. 2026.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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