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]
impervious
(ĭm-pĕr′vē-ŭs) [L. impervius]Unable to be penetrated.