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

Could the generations growing up with their brains hooked to endless video feeds be developing some kind of novel, as-yet-undetectable cognitive brilliance? — Rose Horowitch, The Atlantic, 8 July 2026

Patented techniques exist that alter a film's audio track just enough to be undetectable to a paying audience but detectable, and degraded, on a bootlegged copy. — Damion Taylor, Forbes.com, 7 July 2026

Thanks to his medication, doctors have confirmed to him that the virus has reached undetectable levels in his body. — Luke Chinman, PEOPLE, 29 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

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