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

Such currents are the leading cause of wildfires, which, on average, go undetected for 24 hours. — Elizabeth MacBride, Forbes.com, 23 July 2026

If 1 in 300 young people has an undetected heart condition, these conditions can hardly be considered rare. — Torie Bosch, STAT, 18 July 2026

The trial will be carried out on 50 healthy adults in Oxford, UK, against the new Bundibugyo strain, which spread undetected in the DR Congo for weeks and for which there is no known vaccine or treatment. — semafor.com, 15 July 2026

The cause of death was an undetected ascending aortic aneurysm. — Sean Gregory, Time, 10 July 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