un·​de·​tect·​able | \ ˌən-di-ˈtek-tə-bəl How to pronounce undetectable (audio) , -dē-\

Definition of undetectable

: unable to be detected : impossible to discover or notice : not detectable an almost undetectable change undetectable traces of poison Signs of life may be so minimal as to be undetectable by modern instruments …— Lauren J. Livo

Keep scrolling for more

Other Words from undetectable

undetectably \ ˌən-​di-​ˈtek-​tə-​blē How to pronounce undetectably (audio) , -​dē-​ \ adverb
an undetectably small change

Examples of undetectable in a Sentence

Recent Examples on the Web

The states argued that online access to the undetectable plastic guns would pose a security risk and could be acquired by felons or terrorists. Christopher Carbone, Fox News, "Texan says he's selling 3-D printed gun plans, despite ruling," 28 Aug. 2018 Google said security is an ongoing focus and that its Assistant has features to mitigate undetectable audio commands. New York Times, "Alexa and Siri Can Hear This Hidden Command. You Can’t.," 10 May 2018 This is the key to making them appear much more natural and basically undetectable. Jillian Ruffo, Glamour, "I Tried DIY Eyelash Extensions For A Month And Called It Quits With Mascara," 3 Jan. 2019 Tunnels are also immune to inclement weather, and several dozen feet underground sound is undetectable from the surface. Megan Geuss, Ars Technica, "Ars takes a first tour of the length of The Boring Company’s test tunnel," 19 Dec. 2018 The latest and greatest formulas are more undetectable than ever, no matter their hold level. Melanie Rud Chadwick, Allure, "The 16 Best Hair Sprays on the Market, From Flexible to Strong Hold," 24 Sep. 2018 Antibiotics, hormones, a cancer drug, a chemical found in gasoline, antiseizure medication...research shows that hundreds of unregulated contaminants may be flowing from my tap — largely invisible, tasteless, and undetectable. Rachael Moeller Gorman, Good Housekeeping, "Is Your Tap Water Safe?," 15 Aug. 2012 The action raises public-safety concerns by potentially giving terrorists and other criminals access to undetectable and untraceable firearms, Rupert said. Lewis Kamb, The Seattle Times, "Seattle judge blocks release of downloadable blueprints for producing 3D-printable guns," 27 Aug. 2018 The trouble is that much of the trail of Anna Harvey’s influence is undetectable. Sarah Mower, Vogue, "Remembering Anna Harvey, the Vogue Editor Who Dressed Princess Diana and Translated the Magazine’s Style Across the World," 15 Oct. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'undetectable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of undetectable

1863, in the meaning defined above

Keep scrolling for more

Learn More about undetectable

Statistics for undetectable

Last Updated

8 Apr 2019

Look-up Popularity

Time Traveler for undetectable

The first known use of undetectable was in 1863

See more words from the same year

Keep scrolling for more

More Definitions for undetectable



English Language Learners Definition of undetectable

: impossible to discover or notice : not detectable

More from Merriam-Webster on undetectable

Rhyming Dictionary: Words that rhyme with undetectable

Comments on undetectable

What made you want to look up undetectable? Please tell us where you read or heard it (including the quote, if possible).


to make a payment or contribution

Get Word of the Day daily email!

Test Your Vocabulary

Time Traveler Quiz: Which Word Came First?

  • time traveler quiz which word came first
  • Which came first?
Name That Thing

Test your visual vocabulary with our 10-question challenge!


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!