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
Authorities say Valdez had multiple untreated mental health disorders, including schizophrenia, and that he had been seen in Concord earlier in the day screaming at cars.
—
Nate Gartrell, Mercury News, 29 Mar. 2026
Instead, the embryo was growing inside her right fallopian tube, a placement that made the pregnancy unviable and posed a significant threat to Hall’s health — and life — if left untreated.
—Emily Brindley
health Reporter, Dallas Morning News, 27 Mar. 2026
Cattle succumb to the bacteria within days if left untreated – sometimes within 48 hours of infection.
—Hannah Kinzer, The Conversation, 25 Mar. 2026
If left untreated, the infection can spread to joints, the heart and the nervous system.
—Mary Kekatos, ABC News, 24 Mar. 2026
See All Example Sentences for untreated
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Nate Gartrell, Mercury News, 29 Mar. 2026
Instead, the embryo was growing inside her right fallopian tube, a placement that made the pregnancy unviable and posed a significant threat to Hall’s health — and life — if left untreated.
—Emily Brindley
health Reporter, Dallas Morning News, 27 Mar. 2026
Cattle succumb to the bacteria within days if left untreated – sometimes within 48 hours of infection.
—Hannah Kinzer, The Conversation, 25 Mar. 2026
If left untreated, the infection can spread to joints, the heart and the nervous system.
—Mary Kekatos, ABC News, 24 Mar. 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 5 Apr. 2026.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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