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 of imperceptible

• invisible
• subtle
• indistinguishable

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

Through a meditative duet between the performer’s cognition and their autonomic nervous system, activities that were largely imperceptible to an outside observer became known to the performer. — Sophie Landres, Artforum, 1 Oct. 2026

Meta offers a virtually imperceptible edge in sharpness—37 pixels per degree compared with Apple's 34—but Apple's broader view and sheer pixel count give it the clear win. — Will Greenwald, PC Magazine, 30 Sep. 2026

According to Abramson, the pulses are basically imperceptible, comparable to what a pacemaker sends to the heart. — Peter Hall, Scientific American, 29 Sep. 2026

Masons, carvers and conservators all work towards the preservation and enhancement and even creation of heritage, but as experience and knowledge grows so a gradual almost imperceptible transition occurs. — Literary Hub, 21 Sep. 2026

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