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

In order to go undetected and earn Roper’s trust, Burr gives Pine a fake criminal background and stages a kidnapping of Roper’s son, Danny (Noah Jupe), allowing Pine to play the hero by rescuing him. —Jake Kring-Schreifels, Time, 9 Jan. 2026

Eighteen months earlier, Yorath’s life had been touched by personal tragedy after his 15-year-old son Daniel collapsed and died from an undetected heart condition when the pair were enjoying a kickabout in the family garden. —Richard Sutcliffe, New York Times, 9 Jan. 2026

The department estimated in a letter to the states that have refused to turn over data that the nationwide total combining fraud and undetected errors could be $9 billion a year or more. —Geoff Mulvihill, Fortune, 15 Dec. 2025

Authorities are examining whether the aircraft was launched from land or from an undetected vessel that evaded radar. —Hannah Parry, MSNBC Newsweek, 5 Dec. 2025

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