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

Two years later, Koverman started seeing the signs of untreated pulmonary hypertension again — this time in her sister, Katie Gusching, who had just welcomed her first child. — Kerry Breen, CBS News, 8 Aug. 2026

This untreated runoff makes its way through storm drains and ditches into our local streams and rivers and eventually, the ocean. — Jaclyn Cosgrove, Los Angeles Times, 6 Aug. 2026

If left untreated, gum disease can spread to the bones surrounding your gums, making chewing painful. — Julie Marks, Verywell Health, 5 Aug. 2026

These crucial fields are severely understaffed, causing long wait times and untreated conditions, particularly in rural areas. — John Samuels, Forbes.com, 4 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