[ im-per-sep-tuh-buhl ]
/ ˌɪm pərˈsɛp tə bəl /


very slight, gradual, or subtle: the imperceptible slope of the road.
not perceptible; not perceived by or affecting the senses.


something not capable of being perceived by the senses: metaphysical speculation about imperceptibles.

Nearby words

  1. imperatival,
  2. imperative,
  3. imperator,
  4. imperatriz,
  5. imperceptibility,
  6. imperception,
  7. imperceptive,
  8. impercipient,
  9. imperf.,
  10. imperfect

Origin of imperceptible

From the Medieval Latin word imperceptibilis, dating back to 1520–30. See im-2, perceptible

SYNONYMS FOR imperceptible
Related formsim·per·cep·ti·bil·i·ty, im·per·cep·ti·ble·ness, nounim·per·cep·ti·bly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for imperceptibility

  • Ninety-nine hundredths of this amiable world of ours would have guffawed the poor creature into imperceptibility ages ago.

    The Return|Walter de la Mare
  • He stood up, making an excuse, imperceptibility lurching as he did so.

British Dictionary definitions for imperceptibility


/ (ˌɪmpəˈsɛptɪbəl) /


too slight, subtle, gradual, etc, to be perceived
Derived Formsimperceptibility or imperceptibleness, nounimperceptibly, adverb

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for imperceptibility
Online Etymology Dictionary, © 2010 Douglas Harper