Definition of IMPERVIOUS

not allowing penetration (as by gas, liquid, or light) <the material for this coat is supposed to be impervious to rain>
Near Antonyms absorbent, leaky, porous, unsealed
impossible to get through or into <the rain forest is impervious to all but the most dedicated explorers>
Synonyms impassable (also impassible), impermeable, impervious, impregnable

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