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

What are the imperceptible clues that signal your job is in jeopardy? —Bryan Robinson, Forbes.com, 11 Sep. 2025

Yet for all the focus now on the technology’s effects on jobs or geopolitics, what unsettles Altman most are the subtle, almost imperceptible cultural shifts that spread when millions of people interact with the same system every day. —Preston Fore, Fortune, 11 Sep. 2025

Bespoke clothing is typically made with a greater level of handwork, imparting a nearly imperceptible quality that can’t be replicated with a sewing machine more commonly used on MTM. —Eric Twardzik, Robb Report, 6 Sep. 2025

These nearly imperceptible primordial magnetic fields, despite their weakness, would have played a key role in the universe’s development. —Mrigakshi Dixit, Interesting Engineering, 3 Sep. 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