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
If left untreated, MASH can also progress to cirrhosis and liver cancer.
—
Suchandrima Bhowmik, Health, 24 May 2025
An errant drop or smear of Vaseline can ruin clothes and other fabric goods, especially if left untreated.
—Jolie Kerr, Better Homes & Gardens, 23 May 2025
Stains left untreated can oxidize and set, causing permanent discoloration.
—Shelby Wax, Vogue, 22 May 2025
In more realistic water-flow conditions, that number jumped to 20 times higher than untreated surfaces — especially when higher concentrations of the nanogel were used.
—Jenny Lehmann, Discover Magazine, 16 May 2025
See All Example Sentences for untreated
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Suchandrima Bhowmik, Health, 24 May 2025
An errant drop or smear of Vaseline can ruin clothes and other fabric goods, especially if left untreated.
—Jolie Kerr, Better Homes & Gardens, 23 May 2025
Stains left untreated can oxidize and set, causing permanent discoloration.
—Shelby Wax, Vogue, 22 May 2025
In more realistic water-flow conditions, that number jumped to 20 times higher than untreated surfaces — especially when higher concentrations of the nanogel were used.
—Jenny Lehmann, Discover Magazine, 16 May 2025
See All Example Sentences for untreated
Cite this Entry
“Untreated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/untreated. Accessed 4 Jun. 2025.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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