the GNU version of the Collaborative International Dictionary of English
n. The quality of being impermeable.
The Century Dictionary and Cyclopedia
n. The character or property of being impermeable; impermea-bleness.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the property of something that cannot be pervaded by a liquid
Word Usage
"I observed and noted the resilience of the weathered tree trunks, which, despite the impermeability of the soil and a shortage of water, survived in an inhospitable setting—bravery that I never had shown."