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impermeable 
impermeable definition
im·per·meable (im pʉr′mē ə bəl)
adjective
not permeable; not permitting fluids to pass through it; impenetrable
Etymology: LL impermeabilis
Related Forms:
- impermeability im·per′·meabil′·ity noun
- impermeably im·per′·meably adverb
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