imperceptible

adjective

im·​per·​cep·​ti·​ble ˌim-pər-ˈsep-tə-bəl 

: not perceptible by a sense or by the mind : extremely slight, gradual, or subtle

imperceptible differences

imperceptibly

ˌim-pər-ˈsep-tə-blē 

adverb

Synonyms

• impalpable
• inappreciable
• indistinguishable
• insensible

Examples of imperceptible in a Sentence

These changes will be imperceptible to most people.

a slight difference in hue between the two glasses that's imperceptible unless they're placed side by side

Recent Examples on the Web

The notes are basically imperceptible, and the one note the speakers can hit seems to leap out of nowhere in the mix. —PC Magazine, 4 June 2025

Five years later, the outlines of these words are almost imperceptible. —Alfredo Sosa, Christian Science Monitor, 18 May 2025

The hood protects your neck like the Wu-Tang Clan, while thumbholes, dropped shoulders, and imperceptible seams ensure an unimpeded, chafe-free range of movement. —Drew Zieff, Outside Online, 16 May 2025

Researchers showed that by altering just a small number of pixels in the image—changes imperceptible to human eyes—the AI model misclassified the panda as a gibbon. —Hessie Jones, Forbes.com, 3 Apr. 2025

Word History

Etymology

Middle English, from Middle French, from Medieval Latin imperceptibilis, from Latin in- + Late Latin perceptibilis perceptible

First Known Use

15th century, in the meaning defined above

Rhymes for imperceptible

• acceptable
• perceptible
• susceptible
• unacceptable

Kids Definition

imperceptible

adjective

im·​per·​cep·​ti·​ble ˌim-pər-ˈsep-tə-bəl 

1

: not noticeable : not perceptible by a sense or by the mind

one whose beauty was imperceptible to others

2

: hardly noticeable : very small or gradual

an imperceptible smile

imperceptibly

-blē 

adverb