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

The tool, developed by independent AI engineer Luke Geel, analyzes past results and players’ activity—from posture to blink rate—spotting connections that might be imperceptible to the average viewer but visible to top pros. — Jacob Feldman, Sportico.com, 3 July 2026

At first, the change is imperceptible but Nick notices that his sleepy village seems more vibrant, more populated with people. — Los Angeles Times, 19 June 2026

My dream foundation is one that conceals blemishes but is so imperceptible that people will ask me about my skin care routine. — Kaelin Dodge, InStyle, 16 June 2026

In my testing, signs, labels, license plates, odometers, VINs and document modifications came out imperceptible. — Jeffrey McGregor, Forbes.com, 5 June 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