impervious

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im·per·me·a·ble

(im-per'mē-ă-bĕl),
Not permeable; not permitting the passage of substances (for example, liquids, gases) or heat through a membrane or other structure.
Synonym(s): impervious
[L. im- permeabilis, not to be passed through]
Farlex Partner Medical Dictionary © Farlex 2012

impervious

(ĭm-pĕr′vē-ŭs) [L. impervius]
Unable to be penetrated.
Medical Dictionary, © 2009 Farlex and Partners