Definitions

imperceptible

[im-per-sep-tuh-buhl] / ˌɪm pərˈsɛp tə bəl /

ADJECTIVE

hard to sense; faint

Synonyms

STRONGEST

gradual inaudible indistinguishable insignificant invisible microscopic subtle undetectable

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

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.

Beside him, his mother gave a small, almost imperceptible shrug.

From BBC • Jun. 1, 2026

"The patterned nanostructures are imperceptible to the human eye, about the size of the wavelength of visible light," Dionne adds.

From Science Daily • May 30, 2026

Methane gas may be imperceptible, but the garbage that produces it is not -- Tiltil's 17,000 inhabitants have grown increasingly concerned about the health impact of such drastic pollution.

From Barron's • May 13, 2026

Since then, an October study published in the journal Frontiers in Sports and Active Living showed just how much could be gained by a nearly imperceptible amount of extra fabric.

From The Wall Street Journal • Feb. 6, 2026

Step by step it evolved, so slowly as to be nearly imperceptible.

From "Do Androids Dream of Electric Sheep?" by Philip K. Dick

Vocabulary lists containing imperceptible

The Crucible

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The Old Man and the Sea

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A Wrinkle in Time

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!