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 the condition remains untreated, people can develop cirrhosis and require a liver transplant.
—
Lauren J. Young, Scientific American, 27 Apr. 2026
The worst outcome is hearing a no; the best is a manageable monthly payment that keeps your pet from going untreated.
—Angelica Leicht, CBS News, 27 Apr. 2026
After being bitten, people may develop a rash, but if left untreated, symptoms can include fever, facial paralysis, arthritis, heart problems, dizziness, nerve pain, inflammation of the brain and spinal cord and pain in the hands or feet, according to the CDC.
—Charna Flam, PEOPLE, 25 Apr. 2026
The city’s sewer systems often overflow during storms, causing untreated sewage and water to flood streets and basements.
—Staff Report, Hartford Courant, 25 Apr. 2026
See All Example Sentences for untreated
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Lauren J. Young, Scientific American, 27 Apr. 2026
The worst outcome is hearing a no; the best is a manageable monthly payment that keeps your pet from going untreated.
—Angelica Leicht, CBS News, 27 Apr. 2026
After being bitten, people may develop a rash, but if left untreated, symptoms can include fever, facial paralysis, arthritis, heart problems, dizziness, nerve pain, inflammation of the brain and spinal cord and pain in the hands or feet, according to the CDC.
—Charna Flam, PEOPLE, 25 Apr. 2026
The city’s sewer systems often overflow during storms, causing untreated sewage and water to flood streets and basements.
—Staff Report, Hartford Courant, 25 Apr. 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 2 May. 2026.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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