impermeable

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impermeable

 [im-per´me-ah-b'l]
not permitting passage, as for fluid.

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]

im·per·me·a·ble

(im-pĕr'mē-ă-bĕl)
Not permitting the passage of liquids, gases, or heat through a membrane or other structure.
[L. im- permeabilis, not to be passed through]