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

It's not considered to be a complete cure, instead settling for HBV's DNA and viral protein – HBsAg – remaining undetected for 24 weeks once all other treatment has been stopped. — New Atlas, 22 Oct. 2026

The latest outbreak was first detected in Congo in May after spreading undetected for months, according to the World Health Organization. — ABC News, 21 Oct. 2026

Some patients with a clot in a superficial vein may also have an undetected clot in a deep vein in the muscle, or a clot could travel from a superficial vein to a deep vein and create a more serious situation. — Jen Christensen, CNN Money, 20 Oct. 2026

As a result of the fine, Treasury said that Bank of America will work with a third party to report any further transactions to FinCEN that had gone undetected. — Arkansas Online, 14 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