Etymology
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impermeable (adj.)

1690s, from French imperméable or directly from Late Latin impermeabilis, from assimilated form of in- "not, opposite of" (see in- (1)) + permeabilis (see permeable). Related: Impermeability.

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Definitions of impermeable

impermeable (adj.)
preventing especially liquids to pass or diffuse through;
impermeable stone
an impermeable layer of scum
a coat impermeable to rain
From wordnet.princeton.edu