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

Their flavor is almost undetectable when blended with other ingredients. —Chelsea Rae Bourgeois, Health, 21 Jan. 2026

Beleaguered professors, who are largely poorly paid adjunct instructors at this point, will now have to not just contend with essay mills and good old-fashioned cut-and-paste plagiarism, but also the undetectable autograph of the robotic hand. —Literary Hub, 21 Jan. 2026

Their easy, legging-like feel is undetectable thanks to their classic five-pocket design, stitch detailing, and button and zip closure on the elastic waistband. —Clara McMahon, PEOPLE, 17 Jan. 2026

This is because, in 2026, facelifts aren’t the only major surgery reaching into the undetectable deep plane. —Essence, 7 Jan. 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