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

The imperceptible do-si-do of my matter and yours in the air between us. —Betty Gilpin, HollywoodReporter, 9 Oct. 2025

There was chatter that recuts were happening post-Cannes, but the unchanged running time suggests those edits are imperceptible. —Ryan Lattanzio, IndieWire, 6 Oct. 2025

Then, instead of the tell-tale metal frame of futons in your college days, this sturdy metal frame is imperceptible, but can be adjusted into four different positions, including the fully flat full-size bed. —Yelena Moroz Alpert, Architectural Digest, 19 Sep. 2025

By synthesizing data streams from multiple sources, AI can identify patterns and trends that would be imperceptible to human clinicians. —Kent Dicks, Forbes.com, 16 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