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Synonyms

untreated

British  
/ ʌnˈtriːtɪd /

adjective

  1. (of an illness, etc) not having been dealt with

  2. not having been processed in any way

    untreated sewage

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Melanoma is the most serious form of skin cancer and, untreated, can be deadly.

From BBC • May 21, 2026

All of those properties stand close to Coronado’s wide, sandy beaches — which means they all face challenges as waters are often fouled by the northward flow of untreated sewage from greater Tijuana.

From Los Angeles Times • May 13, 2026

Young mice showed low levels of the MDM2 protein, while untreated older mice had much higher levels.

From Science Daily • May 9, 2026

One facility, San Antonio de los Buenos, can’t handle the volume, so mostly untreated sewage pours through a canyon creek and into the Pacific 5 miles south of the border, U.S. officials said.

From The Wall Street Journal • May 4, 2026

Kwadzo died one morning, probably from his untreated wound, Amari thought, or maybe from his untreated sorrow, but she could not mourn his loss.

From "Copper Sun" by Sharon M. Draper

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