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
Mouse models also showed an increase in recovery with Thiorphan compared with untreated animals, and even more so when Thiorphan was combined with a neural stem cell implant.
—
Ashley MacKin Solomon, San Diego Union-Tribune, 4 Nov. 2025
The condition, present from birth, can cause pain and irreversible damage if untreated.
—Melissa Fleur Afshar, MSNBC Newsweek, 4 Nov. 2025
Whooping cough, or pertussis, is a contagious respiratory disease that typically begins with common cold symptoms and then worsens if left untreated.
—Sofi Zeman, Kansas City Star, 4 Nov. 2025
If diabetes is left untreated, your risk for serious health conditions (including kidney disease, heart attack, stroke, blindness and amputations) vastly increases, says O’Mahony.
—Caroline C. Boyle, USA Today, 3 Nov. 2025
See All Example Sentences for untreated
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Ashley MacKin Solomon, San Diego Union-Tribune, 4 Nov. 2025
The condition, present from birth, can cause pain and irreversible damage if untreated.
—Melissa Fleur Afshar, MSNBC Newsweek, 4 Nov. 2025
Whooping cough, or pertussis, is a contagious respiratory disease that typically begins with common cold symptoms and then worsens if left untreated.
—Sofi Zeman, Kansas City Star, 4 Nov. 2025
If diabetes is left untreated, your risk for serious health conditions (including kidney disease, heart attack, stroke, blindness and amputations) vastly increases, says O’Mahony.
—Caroline C. Boyle, USA Today, 3 Nov. 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 9 Nov. 2025.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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