Imperceptible

adj, noun

adj, noun ·5 syllables ·Moderate ·College level

Definitions

Noun
  1. 1
    Something that is imperceptible.

    "The worm that cauſeth it, is it any thing elſe but one of thoſe little Creatures, that hath deprived it ſelf from all ſocitety, to eſtabliſh it ſelf a Gyant in its own Countrey? If you ask me, VVhy they are bigger then other imperceptibles? I muſt ask you, VVhy Elephants are bigger then we?"

Adjective
  1. 1
    Not perceptible, not detectable, too small in magnitude to be observed.

    "We all missed the imperceptible shake of his head as he tried to warn us without being seen."

  2. 2
    Beyond the purview of man; too great and all-encompassing to be perceived.
Adjective
  1. 1
    impossible or difficult to perceive by the mind or senses wordnet

Synonyms

All synonyms
impalpableunobservableimperceivableundistinguishableunperceivableaerial

Example

More examples

"The truth is opaque and consequently imperceptible."

Etymology

Inherited from Middle English imperceptible, from Middle French imperceptible and its etymon Medieval Latin imperceptibilis. By surface analysis, im- + perceptible.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.