untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd How to pronounce untreated (audio)
: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The untreated ectopic pregnancy resulted in one of her fallopian tubes rupturing. Vanessa Etienne, People.com, 6 June 2025 While most ovarian cysts are completely harmless, there is a small chance that complications could arise if larger cysts are left untreated. Caroline C. Boyle, USA Today, 4 June 2025 Some of these infections stop on their own, but others are too stubborn, or too serious, to leave untreated. Sam Walters, Discover Magazine, 4 June 2025 Among the potential consequences of untreated body dysmorphia: anxiety, extensive medical bills, severe depression and suicidal thoughts and behaviors. Scott Lafee, San Diego Union-Tribune, 3 June 2025 See All Example Sentences for untreated

Word History

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of untreated was in the 15th century

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Cite this Entry

“Untreated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/untreated. Accessed 12 Jun. 2025.

Medical Definition

untreated

adjective
un·​treat·​ed -ˈtrēt-əd How to pronounce untreated (audio)
: not subjected to treatment
an untreated disease

More from Merriam-Webster on untreated

Last Updated: - Updated example sentences
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