undetectable

adjective

un·​de·​tect·​able ˌən-di-ˈtek-tə-bəl How to pronounce undetectable (audio)
-dē-
: 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
undetectably adverb
an undetectably small change

Examples of undetectable in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Most of them were undetectable under our favorite tank tops. Brigitt Earley, Glamour, 30 June 2025 The shorts hit just under the bust and were undetectable beneath tight-fitting clothes, including a thin ribbed dress. Michelle Rostamian, People.com, 26 June 2025 The creepiness that offset the camp in the first movie is undetectable. David Rooney, HollywoodReporter, 25 June 2025 The drugs are undetectable, a fact that threatens to destroy competitive sports forever. Barry Levitt, Time, 20 June 2025 See All Example Sentences for undetectable

Word History

First Known Use

1863, in the meaning defined above

Time Traveler
The first known use of undetectable was in 1863

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Cite this Entry

“Undetectable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undetectable. Accessed 16 Jul. 2025.

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