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• a  impossible or difficult to perceive by the mind or senses
  an imperceptible drop in temperature
  an imperceptible nod

• Either way the spores would be imperceptible, because in order to be used as a weapon, the particles have to be microscopic in size.
• Through previous centuries, eating changed by nearly imperceptible degrees, and mostly toward just getting enough.
• But nothing in evolution has prepared us to understand the cumulative impact that imperceptible amounts of industrial chemicals may have on our children's health or the slow-moving .

• unperceivable

• perceptible

News & Articles

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• Greg Johnson: Evolution can be messy, but the strong survive
  Evolution can come quickly, disturbing or disrupting the status quo, or it can come over longer periods of time in subtle, somewhat imperceptible ways. In either case, change is messy and often painful.
  June 12, 2013 - Knoxville News Sentinel

Quotes

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• Jean-Claude Juncker in Independent Online
  People will tell you Europe is not in a crisis - it is in a profound crisis,a gloomy Luxembourg Prime Minister Jean-Claude Juncker said after chairing Friday's failed summit. "I fear a long, creeping, almost imperceptible weakening...... a...
• Neil Postman in Rutland Herald
  Human beings are so much larger than insects, it's very hard for us to appreciate that what to us is an imperceptible change in habitat can have devastating consequences for a species like the bizarre and beautiful large blue butterfly. A... Jeremy Thomas http://www.google.com/url?q=http://en.wikipedia.org/wiki/Jeremy_Thomas&source=dictionary&usg=AFQjCNErVnO-2dBryaYkBoOmZfGPeTBFfw Science Daily (press release) http://www.google.com/url?q=http://www.sciencedaily.com/releases/2009/06/090615185420.htm&source=dictionary&usg=AFQjCNEryxWP4UNTOm6a9AQaNt2pgkcQlw Jun 16, 2009 49959 67683 imperceptible Television has become, so to speak, the background radiation of the social and intellectual university, the all-but-imperceptible residue of the electronic big bang of a century past, so farmiliar and so integrated with American cutlure that we no...