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

The panel did not address the safety of SSRIs following delivery, but numerous studies show that taking SSRI antidepressants while breastfeeding is low risk, usually producing low to undetectable drug levels in infants. —Andrew Novick, The Conversation, 31 July 2025

Another man with undetectable HIV was unable to access his medication for days. —Nicole Widdersheim, The Orlando Sentinel, 29 July 2025

Additionally, the magnetic field can stabilize the surgeon’s hand movements, reducing the impact of small, undetectable tremors. —Jennifer Esposito, Forbes.com, 16 June 2025

This means that people who are on effective antiretroviral therapy and maintain an undetectable viral load cannot pass the virus on. —Melissa Fleur Afshar, MSNBC Newsweek, 5 June 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