imperceptible


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im·per·cep·ti·ble

 (ĭm′pər-sĕp′tə-bəl)
adj.
1. Impossible or difficult to perceive by the mind or senses: an imperceptible drop in temperature.
2. So subtle, slight, or gradual as to be barely perceptible: an imperceptible nod.

im′per·cep′ti·bil′i·ty, im′per·cep′ti·ble·ness n.
im′per·cep′ti·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

imperceptible

(ˌɪmpəˈsɛptɪbəl)
adj
too slight, subtle, gradual, etc, to be perceived
ˌimperˌceptiˈbility, ˌimperˈceptibleness n
ˌimperˈceptibly adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

im•per•cep•ti•ble

(ˌɪm pərˈsɛp tə bəl)

adj.
1. very slight, gradual, or subtle: the imperceptible slope of the road.
2. not perceived by or affecting the senses.
[1520–30; < Medieval Latin]
im`per•cep`ti•bil′i•ty, im`per•cep′ti•ble•ness, n.
im`per•cep′ti•bly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.imperceptible - impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"
inaudible, unhearable - impossible to hear; imperceptible by the ear; "an inaudible conversation"
impalpable - imperceptible to the senses or the mind; "an impalpable cloud"; "impalpable shadows"; "impalpable distinctions"; "as impalpable as a dream"
invisible, unseeable - impossible or nearly impossible to see; imperceptible by the eye; "the invisible man"; "invisible rays"; "an invisible hinge"; "invisible mending"
perceptible - capable of being perceived by the mind or senses; "a perceptible limp"; "easily perceptible sounds"; "perceptible changes in behavior"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

imperceptible

Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002

imperceptible

adjective
1. Incapable of being apprehended by the mind or the senses:
2. So minute as not to be discernible:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Translations

imperceptible

[ˌɪmpəˈseptəbl] ADJ (gen) → imperceptible
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

imperceptible

[ˌɪmpərˈsɛptɪbəl] adjimperceptible
Collins English/French Electronic Resource. © HarperCollins Publishers 2005

imperceptible

adj (→ für jdn) → nicht wahrnehmbar; difference, movement alsounmerklich; sight alsounsichtbar; sound alsounhörbar
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

imperceptible

[ˌɪmpəˈsɛptəbl] adjimpercettibile
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in classic literature ?
Hence a very small animal organism cannot be beautiful; for the view of it is confused, the object being seen in an almost imperceptible moment of time.
But now in a city which admits of this community, the tie of friendship must, from that very cause, be extremely weak, when no father can say, this is my son; or son, this is my father; for as a very little of what is sweet, being mixed with a great deal of water is imperceptible after the mixture, so must all family connections, and the names they go by, be necessarily disregarded in such a community, it being then by no means necessary that the father should have any regard for him he called a son, or the brothers for those they call brothers.
But, though so little had seemed to happen, and though our walking record was shamefully modest, yet, imperceptible as the transition had been, we were, quite insensibly indeed, and unacknowledged, in a very different relation to each other than when we had started out from the Morning Star.
He could make himself interesting by a tactful and rugged reserve set off by a grim, almost imperceptible, playfulness of tone and manner.
Still, despite these colossal dimensions, the actual enlargements scarcely exceeded 6,000 times in round numbers; consequently, the moon was brought within no nearer an apparent distance than thirty-nine miles; and objects of less than sixty feet in diameter, unless they were of very considerable length, were still imperceptible.
The world may indeed be considered as a vast machine, in which the great wheels are originally set in motion by those which are very minute, and almost imperceptible to any but the strongest eyes.
While the ear of the former has an external opening, that of the latter is entirely and evenly covered over with a membrane, so as to be quite imperceptible from without.
I had had confidential agents trickling through the country some time, whose office was to undermine knighthood by imperceptible degrees, and to gnaw a little at this and that and the other superstition, and so prepare the way gradually for a better order of things.
If the law allows an opulent citizen but a single vote in the choice of his representative, the respect and consequence which he derives from his fortunate situation very frequently guide the votes of others to the objects of his choice; and through this imperceptible channel the rights of property are conveyed into the public representation.
This vacuum economised the graphite points between which the luminous arc was developed--an important point of economy for Captain Nemo, who could not easily have replaced them; and under these conditions their waste was imperceptible. When the Nautilus was ready to continue its submarine journey, I went down to the saloon.
It was formed of Zeena's obstinate silence, of Mattie's sudden look of warning, of the memory of just such fleeting imperceptible signs as those which told him, on certain stainless mornings, that before night there would be rain.
Only in retrospect can I mark the almost imperceptible growth of my desire.