undetected

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.

The first known case was a nurse who developed symptoms on 24 April, so the virus had been spreading undetected for weeks.

From BBC • May 18, 2026

The World Health Organization declared a global health emergency over an Ebola outbreak in the Democratic Republic of Congo and Uganda, warning that the epidemic could still be spreading undetected.

From The Wall Street Journal • May 17, 2026

A higher threshold may reduce wrongful interventions but could allow legitimate threats to go undetected.

From Salon • May 12, 2026

"This won't eliminate deepfakes entirely, but it can significantly reduce their reach and impact by making it harder for manipulated content to go undetected or unchallenged," he added.

From Barron's • Apr. 24, 2026

Yet, for more than 100 years it lay undetected at the bottom of the ocean.

From "Shipwrecked!" by Martin W. Sandler