undetected

adjective

un·​de·​tect·​ed ˌən-di-ˈtek-təd 

-dē-

: not observed, noticed, or detected

an undetected flaw/error

an undetected illness

These rare mistakes are subtle and may go undetected for months and even years.

—Mario Salvadori

Examples of undetected in a Sentence

Recent Examples on the Web

According to senior law enforcement officials, the suspect did not move undetected through the crowded lobby or pre-parties to arrive at the terrace level. —Nicole Sganga, CBS News, 27 Apr. 2026

Serial killer went undetected for years The first victim, McKinney, was found dead in her Brownsville neighborhood apartment in November 2015 by her home health aide, Reuters reported at the time. —Jeanine Santucci, USA Today, 25 Apr. 2026

The effort entails using tens of thousands of surrogate accounts to go undetected and complex tools to expose proprietary information, Krastios wrote. —Cnn.com Wire Service, Mercury News, 24 Apr. 2026

The effort entails using tens of thousands of surrogate accounts to go undetected and complex tools to expose proprietary information, Krastios wrote. —Lisa Eadicicco, CNN Money, 23 Apr. 2026

Word History

First Known Use

circa 1602, in the meaning defined above

Rhymes for undetected

• disaffected
• disconnected
• disinfected
• interjected
• intersected
• misdirected
• preselected
• recollected
• reconnected
• redirected
• reelected
• resurrected