untreated

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

Left untreated or poorly managed, it can increase the risk of heart attacks and strokes and worsen existing heart and kidney disease.

From Science Daily • May 18, 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

She added: "Our monitoring of untreated and treated water shows no evidence of these substances being present in our supply."

From BBC • May 3, 2026

They sated themselves on stagnant water that had been sitting untreated in a dark tank for who knew how long.

From "Dry" by Neal Shusterman and Jarrod Shusterman