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

But he was greeted by clinicians who assured him that there are now medications that can reduce an individual's viral load to undetectable levels. — Luke Chinman, PEOPLE, 23 June 2026

This four-year-old structural vulnerability in the network’s zero-knowledge proofs (ZKPs) allowed for the undetectable counterfeiting of unlimited tokens. — Sean Stein Smith, Forbes.com, 18 June 2026

Tager explained that the process involved mending the canvas, then treating the layers of paint to ensure that the damage was undetectable. — News Desk, Artforum, 9 June 2026

As a result, drinking fountains that averaged over 58 parts per billion were lowered to undetectable levels of lead. — Christiana Freitag, Chicago Tribune, 8 June 2026

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