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

Synonyms

• crude
• native
• natural
• raw
• rude
• undressed
• unprocessed
• unrefined

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

As the snow settled from Monday's road experience, many began asking how the Indiana Department of Transportation and the Indianapolis Department of Public Works could allow the roads to be left untreated before snow fell on Indianapolis. —Noe Padilla, The Indianapolis Star, 3 Dec. 2024

However, if left untreated, urethritis can lead to long-term damage to the urethra. —Jennifer Welsh Published, Verywell Health, 2 Dec. 2024

Collecting rainwater is a sustainable, cost-effective practice that gives your plants and garden beds pure, untreated water — free from the chemicals found in tap water. —Claire Marks, Austin American-Statesman, 28 Nov. 2024

Dental diseases are expensive to treat, and untreated tooth decay can lead to serious health problems. —Jay Reddick, Orlando Sentinel, 23 Nov. 2024

Word History

First Known Use

15th century, in the meaning defined above

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease