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

That’s almost certainly an undercount, given the number of cases that go undetected or unreported, Lee said. —Los Angeles Times, 22 Apr. 2026

Anthropic has said Mythos has already detected thousands of severe vulnerabilities across every major operating system and web browser, some undetected for decades. —Beatrice Nolan, Fortune, 16 Apr. 2026

While the mistake went undetected, the transportation program was beset by fraud, and its costs tripled to $303 million a year. —Seth Klamann, Denver Post, 16 Apr. 2026

In the meantime, autism sometimes remains undetected for decades, particularly when individuals are adept at hiding their emotional, social and sensory difficulties. —Malana Vantyler, Sacbee.com, 15 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