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

The microscopic structures increased the surface area available for lithium deposition to around four times that of untreated flat copper foil. — Atharva Gosavi, Interesting Engineering, 22 Sep. 2026

Left untreated, severe dengue can kill up to 10% of patients. — Andrés Henao, CNN Money, 21 Sep. 2026

Thoughts of suicide can touch anyone, regardless of age, background or circumstance, and they’re often tied to mental health conditions that go unrecognized or untreated. — Courtney Marx, Sun Sentinel, 20 Sep. 2026

Animals were confined in overcrowded cages, covered in feces and suffered starvation, dehydration, open wounds and untreated medical conditions, Hochman said. — Sandra McDonald, Los Angeles Times, 18 Sep. 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