Also means
waterproof, impermeable
Usage Note
imperméable functions as both a noun (un imperméable — a raincoat) and an adjective (un tissu imperméable — a waterproof fabric). As an adjective it is invariable in form for both genders. The common short form in speech is imper.
Examples
"N'oublie pas ton imperméable, il va pleuvoir."
Natural Translation
Don't forget your raincoat, it's going to rain.

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