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imperceptible

[im-per-sep-tuh-buh l] /ˌɪm pərˈsɛp tə bəl/
adjective
1.
very slight, gradual, or subtle:
the imperceptible slope of the road.
2.
not perceptible; not perceived by or affecting the senses.
noun
3.
something not capable of being perceived by the senses:
metaphysical speculation about imperceptibles.
Origin
1520-1530
1520-30; < Medieval Latin imperceptibilis. See im-2, perceptible
Related forms
imperceptibility, imperceptibleness, noun
imperceptibly, adverb
Synonyms
2. hidden, unperceivable, undetectable.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for imperceptibly
  • It all happened in skiing slowly and almost imperceptibly.
  • Changes, when they do occur, come slowly and almost imperceptibly.
  • It is said the frog could be boiled alive if one raised the temperature imperceptibly slowly.
  • And then slowly, almost imperceptibly, her head would begin to fall again until she was gone.
  • Secular refers to long-term changes that take place slowly and imperceptibly.
  • These ambush predators blend imperceptibly into their surroundings.
  • The pumpkin, the biggest surprise, was my favorite-slightly vegetal and almost imperceptibly sweet.
  • Sometimes a big idea fades so imperceptibly from public consciousness you don't even notice until it has almost disappeared.
  • The server racks are nearly silent, and their internal fans whirr almost imperceptibly.
  • And among them are almost imperceptibly vintage items that have been chosen with a keen eye for design and continuity.
British Dictionary definitions for imperceptibly

imperceptible

/ˌɪmpəˈsɛptɪbəl/
adjective
1.
too slight, subtle, gradual, etc, to be perceived
Derived Forms
imperceptibility, imperceptibleness, noun
imperceptibly, 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
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Word Origin and History for imperceptibly

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."

Online Etymology Dictionary, © 2010 Douglas Harper
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