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

• 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

Tucked within a dense forest and set inside a cave, the restaurant is almost imperceptible from the outside. —Susmita Baral, Travel + Leisure, 7 July 2025

Generally, corn and rice pasta have a mild flavor that’s almost imperceptible under any sauce. —Bestreviews, Chicago Tribune, 18 June 2025

Deepfakes can be detected by analyzing pixel-level abnormalities that are imperceptible to humans. —Rohan Pinto, Forbes.com, 17 June 2025

Among adults and adolescents, there was no difference at all between the two groups; among children, the differences were so minor as to be almost imperceptible. —Paul Tough Eric Jason Martin Krish Seenivasan Brian St. Pierre, New York Times, 13 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