im·per·me·a·ble

[im-pur-mee-uh-buhl]
adjective
1.
not permeable; impassable.
2.
Chemistry, Geology. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc.

Origin:
1690–1700; < Late Latin impermeābilis. See im-2, permeable

im·per·me·a·bil·i·ty, im·per·me·a·ble·ness, noun
im·per·me·a·bly, adverb

impermeable, impervious.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
impermeable (ɪmˈpɜːmɪəbəl) [Click for IPA pronunciation guide]
 
adj
(of a substance) not allowing the passage of a fluid through interstices; not permeable
 
impermea'bility
 
n
 
im'permeableness
 
n
 
im'permeably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Impermeable is a GRE word you need to know.
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adj. rude; shameless
the act of imprecating; cursing.
Etymonline
Word Origin & History

impermeable
1697, from Fr. imperméable, from L.L. impermeabilis, from in- "not" + permeabilis (see permeable).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

impermeable im·per·me·a·ble (ĭm-pûr'mē-ə-bəl)
adj.
Impossible to permeate; not permitting passage.


im·per'me·a·bil'i·ty or im·per'me·a·ble·ness n.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
impermeable   (ĭm-pûr'mē-ə-bəl)  Pronunciation Key 
Relating to a material through which substances, such as liquids or gases, cannot pass. Some substances, such as some types of contact lenses, are permeable to gas but impermeable to liquid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It's futile to expect airports to have impermeable security.
These are layers of porous rocks topped by a cap of impermeable rock, usually
  in the shape of a dome.
But during the winter, increased amounts of sea ice renders the region
  virtually impermeable to all three.
You'll drive onto a half-mile-long train and travel through an impermeable
  underground tunnel.
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