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 of untreated

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

According to an article from South Texas Veterinary Ophthalmology, 75 percent of dogs will develop cataracts within 12 months of a diabetes mellitus diagnosis, and blindness can progress quickly when severe or left untreated. —Liz O'Connell, MSNBC Newsweek, 26 Nov. 2025

Natural aging and thinning in untreated areas may still occur, which is why long-term planning is an important part of the consultation. —Wyles Daniel, Freep.com, 25 Nov. 2025

And, if left untreated or poorly managed, diabetes can damage a child’s heart, blood vessels, eyes, kidneys, and nerves, leading to chronic problems and even early death. —​wendy Wisner, Parents, 21 Nov. 2025

Infant botulism can cause muscle weakness, difficulty breathing, and, if untreated, death. —Nicholas Florko, The Atlantic, 18 Nov. 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease