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

Some of this damage may go undetected until the ice thaws in spring and water begins to leak. —Louise Parks, Martha Stewart, 21 Jan. 2026

Partial hearing loss, auditory processing differences, ADHD and mild cognitive disabilities frequently go undetected, particularly among girls. —Keely Cat-Wells, Forbes.com, 16 Jan. 2026

The gold shipment In the final episodes, Choudhary orchestrates the transport of two tons of gold in 40 coffins, expecting the shipment to pass undetected through customs. —Isabella Wandermurem, Time, 14 Jan. 2026

Doctors treating him for the sudden cardiac arrest eventually found an undetected heart defect. —Michele Gile, CBS News, 13 Jan. 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