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imperceptible

[im-per-sep-tuh-buhl]
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adjective
  1. very slight, gradual, or subtle: the imperceptible slope of the road.
  2. not perceptible; not perceived by or affecting the senses.
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noun
  1. something not capable of being perceived by the senses: metaphysical speculation about imperceptibles.
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Origin of imperceptible

From the Medieval Latin word imperceptibilis, dating back to 1520–30. See im-2, perceptible
Related formsim·per·cep·ti·bil·i·ty, im·per·cep·ti·ble·ness, nounim·per·cep·ti·bly, adverb

Synonyms for imperceptible

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for imperceptible

imperceptible

adjective
  1. too slight, subtle, gradual, etc, to be perceived
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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 imperceptible

adj.

early 15c., from French imperceptible (early 15c.), from Medieval Latin imperceptibilis, from assimilated form of in- "not, opposite of" (see in- (1)) + perceptibilis (see perceptible). Related: Imperceptibly. OED marks imperceivable as "Now rare."

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Online Etymology Dictionary, © 2010 Douglas Harper