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

Nearly 1 in 3 adults in the United States with untreated high blood pressure would benefit from treatment and are not getting it, according to a new study. — Sandee Lamotte, CNN Money, 12 Aug. 2026

The flesh-eating New World Screwworm is the parasitic larva that emerges from eggs laid by flies in the open wounds or body openings of warm-blooded animals and humans, with untreated cases potentially leading to severe injury or death. — Jeremy Hsu, ArsTechnica, 12 Aug. 2026

If left untreated, necrotizing fasciitis can be fatal, sometimes within 48 hours. — Bill Sullivan, The Conversation, 11 Aug. 2026

Heat exhaustion, which occurs when your body can't cool itself through sweating, can progress to heat stroke if left untreated. — Michael Autovino, CBS News, 10 Aug. 2026

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