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 tumor in their patient's colon had shrunk and was nearly undetectable. —Beth Warren, Nashville Tennessean, 13 Nov. 2025

These bottoms are undetectable as anything other than jeans, due to their photorealistic jean print. —Caroline Hughes, Travel + Leisure, 5 Nov. 2025

Victor Conte, the architect of a scheme to provide undetectable performance-enhancing drugs to professional athletes including baseball stars Barry Bonds and Jason Giambi and Olympic track champion Marion Jones decades ago, has died. —Emma Burleigh, Fortune, 4 Nov. 2025

Her tumors have stabilized, and some are nearly undetectable. —Wendy Grossman Kantor, PEOPLE, 23 Oct. 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