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

Dioxins have a half-life in the body of seven to 11 years, according to the World Health Organization, and lead can also be undetectable in blood but still remain in the body, bound to bones, for decades. — Angus Chen, STAT, 22 July 2026

This cotton gauze design ticks every box with an elastic waistband and side pockets, but the real win is that the fabric is crinkled and textured, which means any wrinkles from the suitcase are undetectable. — Olivia Cigliano, InStyle, 21 July 2026

These tools can even be overlaid on the interview screen itself, claiming to appear invisible and undetectable. — IEEE Spectrum, 13 July 2026

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

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