undetectable

adjective

un·​de·​tect·​able ˌən-di-ˈtek-tə-bəl 

-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

ˌən-di-ˈtek-tə-blē 

-dē-

adverb

an undetectably small change

Examples of undetectable in a Sentence

Recent Examples on the Web

Crucially, Jones’s group figured out how to strip the nitrate from beet juice to create an undetectable placebo, and found that athletes improved their performance when given regular beet juice but not nitrate-free beet juice. —Alex Hutchinson, Outside Online, 19 Apr. 2025

If it can be said that a company that can lay claim to nearly 12% of all U.S. video consumption has been flying under the sports-media rights radar, then YouTube is cruising along at an undetectable altitude. —Anthony Crupi, Sportico.com, 4 Apr. 2025

Sprawling from this central story — full of funny anecdotes about almost getting caught and their solutions to problems like an undetectable wall — is a sober set of concerns. —Alissa Wilkinson, New York Times, 28 Mar. 2025

After all, her cancer was now shockingly undetectable. —Erin Jensen, USA TODAY, 11 Feb. 2025

Word History

First Known Use

1863, in the meaning defined above

Rhymes for undetectable

• collectable
• collectible
• correctable
• delectable
• detectable
• expectable
• injectable
• protectable
• resectable
• respectable
• selectable
• uncollectible