Impermeable is an adjective describing something that does not allow liquids or gases to pass through; it also metaphorically means something that cannot be penetrated or altered. The term is often used in contexts like materials, coatings, and barriers, and it implies a high degree of resistance to permeability. In pronunciation, the stress falls on the second syllable: im-per-MEA-ble or im-per-ME-ble depending on rhythm.
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