Definition of IMPERMEABLE

impossible to get through or into <the wall of security people surrounding the rock band was impermeable>
Synonyms impassable (also impassible), impermeable, impervious, impregnable
not allowing penetration (as by gas, liquid, or light) <an impermeable seal on the ancient tomb had preserved the artifacts exceptionally well>
Near Antonyms absorbent, leaky, porous, unsealed

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