Dictionary.com
Thesaurus.com
Synonyms

undetected

British  
/ ˌʌndɪˈtɛktɪd /

adjective

  1. not perceived, noticed, or discovered

    the fake bomb passed undetected

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A "dark" vessel -- usually a tanker or cargo carrier -- deliberately disables or manipulates transponders in a bid to go undetected by public tracking systems like Kpler's MarineTraffic.

From Barron's • Mar. 31, 2026

The new research suggests that location can play a major role in whether someone receives a timely diagnosis and proper treatment or whether their condition goes undetected.

From Science Daily • Mar. 9, 2026

The Lockheed Martin aircraft has a stealthy design that allows it to evade being targeted by surface-to-air missiles and enter Iranian airspace undetected.

From The Wall Street Journal • Mar. 6, 2026

Jones began to suspect that she’d had a previously undetected ulterior motive for moving her book to the past.

From Los Angeles Times • Feb. 24, 2026

"It's Dog Squad to the rescue!" cries Nala, who has clambered undetected up to the rafters high above the barn floor.

From "Dog Squad" by Chris Grabenstein