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

If someone played a football game and then had their blood checked for muscle enzymes, Kim said, a test would spot them, but these cases typically go undetected. — Jen Christensen, CNN Money, 4 Nov. 2026

The planes are equipped to locate fires, including small or smoldering fires that might otherwise go undetected, and provide incident commanders with aerial intelligence to help guide firefighting operations. — Brian Maass, CBS News, 3 Nov. 2026

These illustrative figures exclude initial implementation and later consequences of undetected errors. — Swapnil Upganlawar, Forbes.com, 26 Oct. 2026

The Bundibugyo strain of the virus spread undetected for months before the ​outbreak was declared in May. — Reuters, NBC news, 23 Oct. 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