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

The prime minister of the Democratic Republic of Congo rejected framing the country’s relations with Washington as solely based around minerals, and offered a frank account of the cause of early Ebola cases remaining undetected. — Adrian Elimian, semafor.com, 22 Sep. 2026

Adult worms often go undetected in blood vessels, producing no noticeable symptoms, allowing the infection to become chronic. — Beth Mole, ArsTechnica, 22 Sep. 2026

More is surely going on, undetected or unreported, even as there has been a minor online symphony of whistle-blowing, alarm-bell tolling, and pleas for legislative action. — Jill Lepore, New Yorker, 21 Sep. 2026

Scientists have discovered a crater on the moon that's bigger than the Roman Colosseum and is the result of a powerful impact two years ago that initially went undetected. — CBS News, 16 Sep. 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