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undetectable

ADJECTIVE

imperceptible

Synonyms

STRONGEST

gradual inaudible indistinguishable insignificant invisible microscopic subtle

WEAK

ephemeral evanescent fine impalpable imponderable inappreciable inconsiderable inconspicuous indiscernible indistinct infinitesimal insensible minute momentary shadowy slight small tiny trivial unnoticeable vague

Antonyms

WEAK

apparent conspicuous distinct evident noticeable obvious perceptible seeable striking unobscured

ADJECTIVE

imponderable

Synonyms

STRONG

ephemeral fine gradual infinitesimal intangible minute slight small

WEAK

evanescent impalpable inappreciable inaudible inconsiderable inconspicuous indiscernible indistinct indistinguishable insensible insignificant invisible microscopic momentary shadowy subtle tiny trivial unnoticeable unobservable vague

Antonyms

STRONG

big huge important large rough significant substantial thick

ADJECTIVE

inappreciable

Synonyms

WEAK

ephemeral evanescent fine gradual impalpable imponderable inaudible inconsiderable inconspicuous indiscernible indistinct indistinguishable infinitesimal insensible insignificant intangible invisible microscopic minute momentary shadowy slight small subtle tiny trivial unnoticeable unobservable vague

ADJECTIVE

unnoticeable

Synonyms

WEAK

ephemeral evanescent fine gradual impalpable imponderable inappreciable inaudible inconsiderable inconspicuous indiscernible indistinct indistinguishable infinitesimal insensible insignificant intangible invisible microscopic minute momentary shadowy slight small subtle tiny trivial unobservable vague

ADJECTIVE

unobservable

Synonyms

WEAK

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

According to investigators, the thieves went to the libraries to consult rare and valuable works, photographing and measuring them, and returned later to replace them with virtually undetectable copies.

From Barron's • Jun. 9, 2026

The FDA said that most samples that were tested—which included powdered, liquid concentrate, and ready-to-feed formula products—showed undetectable or very low levels of contaminants.

From The Wall Street Journal • Apr. 29, 2026

Yet while the structure is designed to be undetectable from the inside, it’s a full-blown metallic colossus on the outside — visible from the surrounding L.A. freeways.

From Los Angeles Times • Apr. 13, 2026

Drugs suppress the virus and prevent it being passed on in what is known as U=U, meaning undetectable = untransmissible.

From BBC • Dec. 1, 2025

At first it was a couple of pounds a year, undetectable even to him.

From "The Great Santini" by Pat Conroy

undetectable

Example Sentences

Related Words