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
The disease itself is not deadly, but left untreated, the antibodies can infiltrate different parts of the body like the pancreas, lung or liver.
—
David Oliver, USA Today, 23 Apr. 2025
But if left untreated, carbon monoxide poisoning can lead to heart attacks, brain injury, and death.5
How Does Carbon Monoxide Poisoning Happen in Hotels?
—Cathy Nelson, Health, 11 Apr. 2025
Atrial fibrillation is a common type of irregular heart rhythm, and leaving it untreated can lead to a stroke.
—Eloy Geenjaar, The Conversation, 10 Apr. 2025
Left untreated, cavities can raise the risk of malnourishment, lower self esteem, and lead to abscess and more serious infections.
—Lauren Leffer, Popular Science, 9 Apr. 2025
See All Example Sentences for untreated
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.
David Oliver, USA Today, 23 Apr. 2025
But if left untreated, carbon monoxide poisoning can lead to heart attacks, brain injury, and death.5
How Does Carbon Monoxide Poisoning Happen in Hotels?
—Cathy Nelson, Health, 11 Apr. 2025
Atrial fibrillation is a common type of irregular heart rhythm, and leaving it untreated can lead to a stroke.
—Eloy Geenjaar, The Conversation, 10 Apr. 2025
Left untreated, cavities can raise the risk of malnourishment, lower self esteem, and lead to abscess and more serious infections.
—Lauren Leffer, Popular Science, 9 Apr. 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 30 Apr. 2025.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
Love words? Need even more definitions?
Merriam-Webster unabridged
Share