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

Submarines remain key asymmetric weapon in naval strategy Submarines have long been considered a cornerstone of naval strategy, prized for their ability to conduct nuclear strikes, gather intelligence, or target carrier groups while remaining nearly undetectable. —Bojan Stojkovski, Interesting Engineering, 14 Sep. 2025

More than half didn’t know that HIV-positive people can reach undetectable status and not transmit the virus to others. —Scott Malia, The Conversation, 10 Sep. 2025

Since you are no longer supposed to have any prostate tissue in your body, these levels should be undetectable. —Bruce Y. Lee, Forbes.com, 6 Sep. 2025

When the right treatment is available, people can live a normal life with HIV and have an undetectable viral load. —Hannah Millington, MSNBC Newsweek, 26 Aug. 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