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

Public reporting of sick acting deer is one of the best tools available to the DNR for identifying CWD that may exist at low prevalence in previously undetected areas, officials said. —Jalen Williams, Freep.com, 24 Sep. 2025

The teenager, reportedly from Kunduz city, traveled undetected on flight RQ-4401, which landed at Delhi’s Indira Gandhi International (IGI) Airport around 11 am on Sunday, according to Indian news agency PTI. —Sujita Sinha, Interesting Engineering, 23 Sep. 2025

This gap means countless infections go untreated and dangerous, drug-resistant strains spread undetected. —CNN Money, 21 Sep. 2025

Without load and stress testing under realistic conditions, inefficiencies in scaling, response time or fault tolerance may remain undetected. —Expert Panel®, Forbes.com, 19 Sep. 2025

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